It gets even weirder when you expand the scope of the inquiry. Kree, Shiar, and Skrull mutants also exist. This is attributed to tinkering by the Celestials for some reason we don't yet understand. Which ALSO suggests that there is some aspect of Human Mutants that is not fully Human. Like this:
That Sentinel registered a KREE as a Mutant.... a KREE. Why? What is the special secret ingredient that makes a Mutant a Mutant whether Kree or Human?
But yeah... all this stuff kinda takes the "oppressed minority" analogies and throws them out the window. It's been used for so many metaphors that it's over-strained to the point of no longer making sense. I mean, there was one story that seemed to use Mutants as part of a sex slave trafficking analogy. Yeah... really. It's not a metaphor for any specific group... of any kind. It's part of so many metaphors for injustice that it's lost coherence.... which might be why it's so amped up in intensity now. Writers are trying to make up for the confused message with massive imminent danger..... but now most of the X-Men's enemies are either off the board or HELPING them.
Recent stories have lost the nuance that made the old ones good. For example: in the "Fall of Avalon" story arc, several Acolytes died, and their orbital base not only gets destroyed but gets knocked out of orbit. But, the story isn't written to say "they deserved it for being bad guys". no... it's written to show it as a tragedy that befell the enemies of the Xmen, and one the Xmen did their best to help with. More recent stuff tends to be less.... shades of grey I guess? It's weird because nowadays characters temporarily wear black or white hats, and change hats, but.... there's always a black hat.