Huh, yeah, harder to justify it when those things happened, maybe it's because he thought he actually was a mutant at that point and couldn't turn it off even unintentionally, or maybe wasn't thinking "they're hunting me because I'm a mutant, I wish I wasn't one" and thought "I wish those evil people would stop attacking anyone", but I shouldn't overthink comic books (He says, after overthinking comic books ), least of all Slott lol.
I'm still gonna keep the theory I mentioned pages ago in mind if they ever decide to retcon this back, that this is an Avengers Disassembled situation, which Strange told Wanda that she doesn't actually use Chaos Magic because Chaos Magic apparently isn't real, only for retcons to say she went insane and imagined Strange saying that, maybe a retcon will do the same thing, say he went insane and just imagined Xavier saying he's not a mutant lol.
Either way, outside of this retcon being dumb and coming outta nowhere, it kinda sucks to remove him being a mutant because he was like, one the few mutants listed on the human side, and the only Omega level mutant who was, that could have some cool story potentials in Hickman's X-Men, oh well, some stories can still be told but, too bad.