It actually doesn't have anything to do with that theory, but I won't lie, I do like that one.
I wrote a bit about it in response to their question, and I think I misspoke (miswrote?) and kinda jumped the gun. It's not really post- apocalyptic, however the series does seem to document a world in decline.
I'm not sure if you'd consider that apocalyptic (a slow apocalypse), heading towards the apocalypse (what happens if all the Towers are destroyed?), or post-apocalyptic (it seems like the races peaked before any of the games) though.
Edit: I remember why I thought it was post-apocalyptic! Space! Iirc all the races have been to space and had spaceships and space battles, except it seems like everyone has forgotten about it by the time the games take place. Combine that with the destruction of the Towers, and yeah. Seems possible that the Elder Scrolls could be post-apocalypse and is being interpreted as fantasy because the characters of the series don't know how any of the tech works anymore.
Uh, bombing one of Iran's nuclear sites seems like a great way to find out if they've actually figured out nukes or not.
Please don't. Please. Fucking. Don't.
...which of course means they will.