There's an old 1.0 quest entitled 'Of Archons and Muses' which mentions that Archons are the Twelve taking mortal form.

Tyago Moui: Caught wind of all this Archon talk yet? Some folk make them for the very incarnations of the Twelve, come to Eorzea. Old prophecies and wives' tales say they descend from their heavenly seat whenever disaster threatens Eorzea, see. Needless to say, many believe the Archons to have otherworldly powers─both of mind and body. According to the loremasters' books, there was an age of shadow and calamity some fifteen hundred-odd years ago, when a great flood drowned the world─the sixth Umbral Era, they called it. Believers say it was the twelve Archons what came to fight the darkness then.
Seeing the modern-day Archons like Matoya, Y'shtola, Yda and Papalymo, Thancred, G'raha Tia, and Moenbryda, I'm almost certainly sure that they aren't gods and this information no longer applies. But one part of the quest is particularly interesting:

Tyago Moui: They say Ahldbhar was the mightiest of the twelve Archons. Rhalgr the Destroyer himself, taken form in Roegadyn flesh─a bloody mountain of a man, and a fearsome warrior, besides… You must've seen renderings of Rhalgr at some point─in paint or stone. Looks like a bag of angry muscles in a mage's robes, right? Aye, well, those are done in the likeness of Archon Ahldbhar. Ahldbhar fought relentlessly against a clan of wicked sorcerers that sought only to wreak havoc on the world through their dark powers. But then, something happened... Something that threw Ahldbhar into deep despair. And in the end, he turned and took up with the enemy, though none can say as to why.
The part about the 'clan of wicked sorcerers' is without doubt referring to the Ascians; did one of the past Archons turn traitor? And if so, why?

And is any of this information nothing more than outdated lore from before Yoshi-P took the reins? Should it just be completely disregarded, and not to be taken as a hint of dark things to come?