I'd be on board with the "future Redcliffe may not be what Solas' plans will result in" bandwagon if he didn't talk about the expected result of his tearing down the veil being the world "burning in raw chaos". That described future Radcliffe pretty accurately.
Plus, in future Redcliffe, there are Solas' comments about how you'd think "such understanding would prevent me from making such terrible mistakes. You would be wrong." Given hindsight, you might be tempted to think the "terrible mistakes" he's talking about is giving Corypheus his orb, but he says that comment in response to the Inquisitor being surprised that he understood Dorian's explanation about how the amulet had worked. He's talking about his understanding of magic when he says "such understanding". He's not referencing a mistake in judgment in giving Cory the orb, he's referencing a terrible mistake that his understanding of magic should have prevented. And the only mistake of that type that I can think of that he'd be referencing would be how he thought the veil drop would played out vs how he had actually seen it do so over the last year.
See, my issue with it is - why didn't Solas tell us anything in the dark future? "Hey Inquisitor, I know what we're doing right now is super important, but I should probably give you a heads up - I'm Fen'Harel in disguise, my past counterpart is trying to bring about a future a lot like this one, and since I can't directly communicate with him to tell him what an idiot he's being, could you maybe go back and kill him a little when you get there? Kthnxbai."
Like - the only thing I can see preventing him from telling the Inquisitor is that he wants to keep his identity secret. Which is not something I'd think he'd value over the end of the entire world. Besides that? What's he got to lose? Either the Inquisitor believes, stop his past self, and everything's saved. Or the Inquisitor believes, fails to stop his past self, in which case Solas at least tried. Or the Inquisitor doesn't believe him at all, in which case, again, at least he still tried. The worst case scenario is that he gets killed - which appears to be part of his plans anyway, so...
Now obviously, from a writer's perspective, we can't have Solas give everything away right there, because we don't even start to get a hint about his plans until the end of the game. But "Well this illogical thing has to happen for the rest of the plot to work" is an awful excuse, and it's on the writers to write the plot in such a way that everything makes sense. So if Solas was referring to this future, specifically, then it's a massive plot hole, because why would he keep quiet?
EDIT: To clarify my position, I'm in camp "The end result of the Redcliffe future is what Solas wants, but the long-drawn out process Cory's doing to get there, combined with Nightmare's demonic onslaught, the red lyirum Blight everywhere, and the false god crushing everyone beneath his heel, kinda puts Solas off this version of events. His process, while no less chaotic and destructive, would at least be quicker and wouldn't end with a Blighted global dictatorship - but given that the world was Veilless once and worked fine, I fail to see how it makes any sense that being Veilless again would somehow destroy it."
It's a pretty long camp name.