The Dragon Age Old Gods don't appear to be based on the Lovecraft Mythos like the the Warcraft Old Gods are, but I don't think he's wrong about the similarities between the Bioware Titans and the Blizzard Titans. If DA Titans are based on anything it does feel like it is more likely the WoW Titans than Greek Mythology.
It's been a long time since I did any research on the Ancient Greek Titans, so I don't know if they were conceptualized as being made of stone or metal but they definitely didn't have a association with being the creators of dwarves because our modern fantasy image of dwarves didn't exist back then, and the ancient culture and mythology that inspired them wasn't Greek.
DA's Old Gods aren't based specifically on Old Gods in the Cthulhu mythos like Warcraft's are, but the thing that annoys me a bit about them is the concept of "the Song." The Old Gods use it to lure darkspawn and other beings with the darkspawn taint to the location of their prisons in order to release them, in a similar way the Old Gods in Warcraft use "whispers" to do the same with the Twilight's Hammer and other weak-minded individuals. That idea might not really be new either, but it does stick out to me.
I could honestly go a lot further with the Warcraft comparisons. I could go into similarities between DA:I's demonic invasion and the Burning Legion, similarities between the Dalish Elves and the Night Elves, some similarities between the Fade and the Emerald Dream, the origin stories in DA:O and the starting areas in WoW, and probably some more stuff. However, I admit I'd have to stretch things a bit more for those to be really relevant.
However, factoring everything together (that's REALLY important since taken individually these elements mean nothing), the number of similarites does bother me a bit. You all might not see it, but I do.