Yes huh. But that was before he was Dagon. And it makes sense really. He want's to destroy the pieces of Nirn he hid, so that he can become the kind Leaper Demon King again.
Personally, I have more faith in lore from the Mer's perspective than that of the humans. I think they get everything wrong.
Do you have a reason for thinking this? Alduin is apparently the antagonist, and He is a Nordic (and Redguard, but they call Him Satakal) god. And Akatosh (well, Martin became Akatosh and fought Dagon) helped during the Oblivion crisis.