While “gender essentialist” TERFs claim that people are born either male or female and that people cannot change their biological sex, this contradicts the American Medical Association (AMA)’s 2018 statement opposing any “efforts to deny an individual’s right to determine their stated gender identity.”
Well it can only be said that TERFs are obviously correct, and the AMA is wrong.
Or more exactly, the AMA is getting involved in an ideology that doesn't really claim you can change biological sex but just wants gender identity to supercede it.
That's not a scientific medical issue. Maybe it's "medical" in that these guys think it's best practice to treat transgender people in that sort of way, but it's not like it's a scientific question that they are the specialists on, and gender identity really does supercede biological sex.
So the AMA aren't legitimate experts and this is an appeal to authority fallacy.