No true scotsman defense? To each their own, you may do as you please, but your restrictions I don't find binding to myself.
Here is an example:
During the second era, Cyrodiil was a jungle province. Until Tiber Septim reshaped it into what it is now. In ESO, the place is already like it is in Oblivion after Tiber had changed it.
"To each their own" doesn't matter. Opinions do not matter. The game is lore-breaking in many aspects and none of what's in it should be considered canon.
The whole "Alliance War" has never been mentioned, or two of the alliances, those being Daggerfall Covenant and Ebonheart pact have never been mentioned anywhere else. As far as we know, the only empire during the Interregnum is the one of the Reachmen which later of course was taken over by Tiber Septim who continued to conquer the entire continent. Also, Arenthia is considered Khajiit in ESO even though it's Bosmer as far as I know.
The game is full of these sorts of lore-breaking things. Don't take anything in it as actual lore.