Yes, but how can Akatosh ascend to Aetherius?
So, Nu-Mantia:
"Auriel-that-is-Akatosh returned to Mundex Arena from his dominion planet, signaling all Aedra to convene at a static meeting that would last outside of aurbic time. [...] that by consent of presence their actions here would last of a period unassailable, and would be so whatever might come later to these spirits, even if they rejoined the aether or succumbed willingly or by treachery to a sithite erasure."
"The powers also created Red Tower and the First Stone. This allowed the Mundus to exist
without the full presence of the divine."
Auriel ascends, but is
still present by Convention's immutable momenta.
And it's not that they think an elf became a god, Prometheus, but that gods became elves. Or gave birth to them, at least.