Namor was altered in Black Panther: Wakanda Forever, which justifies his absurdly high level of power.
It's no secret that Ryan Coogler's Black Panther sequel has significantly changed the Sub-storyline Mariner's after two trailers.
The choice to replace Atlantis with Talocan, a legendary civilisation associated with Aztec mythology, is the cause of these modifications.
M'Baku refers to Namor in the Black Panther 2 trailer as the "Feather Serpent" and talks about him as though he's a deity in the MCU. It is obvious that Tenoch Huerta's persona has a reputation that Namor did not have in the original work.
The hero from the comic books belonged to a species that breathed water, and he was in no way comparable to any mythological deity.
Going in this approach represents a significant departure from his comic book origin, but it also offers a better explanation for how he got his powers than the comics offered.
It’s worth noting that the other members of the Atlantean race in Marvel Comics can’t compare to the power level of their king.
Most Atlanteans are not even close to the level of the Sub-Mariner, who has easily dispatched heroes like Spider-Man, Wolverine, and Captain America despite being physically superior to humans in many respects.
It's no secret that Ryan Coogler's Black Panther sequel has significantly changed the Sub-storyline Mariner's after two trailers.