The Tsaesci joined the Padomaic side of the dichotomy.
"They ate them" means the Tsaesci took the place of man, and they're going to do the whole "man" thing, better. That's how they began; the Tsaesci usurped the "Yellow Threat" of the bad lore. I notice their similarity to the Hunger of Satakal. The Tsaesci are the consuming hunger of Akavir. How about Alinor's Dragon Emperor, who is the mirror-brother of Tosh Raka.
Sure, the Tsaesci took the place of men, and men typically go for the Padomaic (ie Lorkhan good, Akatosh bad) side of things. But that's inconsequential in the grand scheme of things. And as for the king of Alinor, what, something wrong with the Septims? All that dragon symbolism they wrap themselves in isn't exactly powerless.
Actually, you mentioned a similarity to the hunger of Satakal (who in turn resembles Alduin).
I think what we're looking at is a Redguard-type situation. The Redguards believe that their version of Lorkhan, Sep (The
Serpent, no less!) was driven crazy by Satakal's hunger, while Tall Papa (Akatosh) shows mortals how to persist beyond one lifetime, which could be seen as the usual mannish way of living through one's children. In Yokudan mythology, the roles of Lorkhan and Akatosh are switched from their usual human positions. Lorkhan is the crazy one, while Akatosh is the one with mannish values.
As in, the Redguards (and IMO, the Tsaesci) are men who act like elves.
I mean, this isn't a perfect argument, but I think it's a good starting point, as it shows that the standard Human-Padomay, Elf-Anu isn't necessarily the be all and end all.