And as I say, it's certainly the way I interpret things too.
However, confirmed by a Dev or not, it's a third party article. It cannot be considered TRUE canon, when referenced, because it's not part of any Official TES product.

Yes, but Im not finicky like that about stuff.
Also, you cannot define TES canon solely by what appears in-game.
Some TES lore comes from dev quotes on this forum as well.
I dont really like to use the word 'canon', it feels restrictive.
Maybe its not
canon but it certainly is
lore.
Also, the fact that developers pretty much said this explanation is what happened lends 'canonicity', I think, for people who are finicky about this sort of stuff.
Now that doesnt mean anyone of us or our player characters has to
believe it, there is plenty room for conflicting views in TES, look at Mannimarco and his following, for one of many examples, or those crazy things Mankar Camoran said.
Yet, when you view it in an out-of-universe context this kind of 'truth' is handy as a starting point, a baseline, the bones to start imagining from.