So I mentioned a day or two ago that I think the Titans are related to the statues in the Primeval Thaig. It's my belief that these statues represent what the Dalish consider The Forgotten Ones, however I can't say whether i'd believe they're the Old Gods as well. I admit there is a compelling case to be made for them, knowing full well that Solas is Fen'Harel and that he did lock away the Elven gods and seeks to bring them back.
In the tale the Dalish tell us the Forgotten ones were sealed into the abyss. Years ago I and others had entertained the notion the Old Gods, who were also cast into the abyss deep within the earth, might be the same group. It would also explain why Solas doesn't care much for the Grey Wardens, given that 1) The Old Gods are dragons or in a dragon-esque shape, a form considered very sacred to the ancient Elves, 2) they're just as much his friends as the Creators.
In fact, now that I think on it, with the codex talking about a spear of golden light and the tale of Fen'Harel promising the Forgotten Ones a powerful weapon to end their war with the Creators... it would explain why the Old Gods might've sought to have someone enter the Golden City. They were tricked and deceived but still believed in the weapon. Or perhaps it's a Pandora's Box type of thing. The Golden City had one good thing maybe and a host of awful things locked within, thus explaining why Corypheus and his drinking buddies found only dead whispers and corruption, a blackness that they even so allowed to permeate and suffuse their very being.d
There's also the image of Solas and FleMythal embracing, much like the Red Lyrium Idol's imagery, which indicates a sort of ability to predict what is going on in the world thousands of years in the future.
I wish I had a good image of the statues in the PT. But we also know that the Elves planned to assault "the Pillars of the Earth" and their workers that were "witless, soulless, scurrying about" -- the latter indicating Darkspawn. Tying back into my PT is linked to the origins of the Darkspawn theory, perhaps the PT Dwarves were once masters of the Darkspawn. It could explain why the Darkspawn avoid the area and yet will defend it to the death -- perhaps a sort of reverence of old? Instinctual guarding of it?
there is a connection between certain types of magic and the Taint, specifically blood magic and the magic of the Elves. We can see as much from Marethari's healing magic being able to fight the Taint in Mahariel just by itself, with no help or lyrium. Merrill's was able to cleanse the taint from the Eluvian fragment when amplified with her own blood.
Genlock Emissaries will use the taint in their own system as a means to cast magic, implying a connection between the Taint and magic. Moreover, since they're the mutated progeny of Dwarven broodmothers, it hints at a lingering connection between Dwarves and magic -- where the idea of them being Mages when they lived in the PT comes into play.
We know Andruil at one point hunted the Forgotten Ones, beings that dwelt in the abyss, and that she had crafted armor and weapons of the Void -- which would cause one to go mad. The Taint likewise causes one to go mad, and Andruil's lands ended up suffering plague. What if the Void holds a connection to the Anvil of the Void? Or to be more precise, the Anvil is connected to the Void, which may be connected to the days of the PT Dwarves and their worship of their gods -- perhaps believing lyrium to be a manifestation of their gods?
I had already said that I believe the Anvil to be a relic of the olden days of the PT Dwarves... and that I believe a PT rests somewhere around the Orzammar-Bownammar area due to how improbable it'd be for a scavenger to have gone to Kirkwall's PT, across the Waking Sea and Ferelden from below, and into Orzammar while avoiding the Darkspawn at first and surviving the Taint long enough to still be somewhat coherent and alive in the end.
And it would make sense to believe the PT Dwarves were not isolated in one area, but rather spread throughout, as Bartrand does say the PT rests beneath the Deep Roads -- that we can access them at all through carved passages means they obviously naturally connect. It takes five days to get to the PT from the Deep Roads part where the Dragon was fought.
Anyway, what was I saying? Titans and PT Dwarves? They were probably the gods to the Dwarves, and although there is something that could make the Old Gods seem like Titans from a lore perspective I'd be a bit bothered also if the Old Gods were recycled for another religion, since Kieran's comment doesn't present the Titans and Old Gods as being linked like... at all. I'd much rather the Titans be what the Elves considered the Forgotten Ones, rather then Titans = Forgotten Ones = Old Gods.
Given the iconography of the statues in the PT and the statues recovered from the scavenger suggest that, like the idols we get in Inquisition of Paragons, these statues were representative of the Titans. "Clearly Dwarven in make" and "not resembling any Paragon on record" tells us that... well... they wouldn't have compared it to existing records if it looked abnormal and alien. Gaider himself said the architecture was clearly Dwarven in nature (this wasn't in question all that much, but it's good to know even so).
The loading screen for the PT shows bearded figures wearing some strange sort of clothing, and I'd almost venture a guess it's made from stone... if not lyrium.

It's also interesting to note that Golems, even in a base form with no alterations, are able to cast magic... no doubt owing to the lyrium, but I imagine it's a lingering element of the Dwarves' aptitude for magic as well. Perhaps lyrium isn't just alive with the souls of Dwarves (if it is at all, for my theory may be wrong) but perhaps lyrium is actually the remnant of the Dwarves' magic? That is to say, they severed the tether connecting them to the Fade and their magic sprung forth into the Stone and because it was a part of them it was alive... and thus the reason why it amplifies a mage's magic is because they're taking from what the Dwarves once were?