SRY gene is part of how sex is determined, but not how sex is defined.
..by Donald Trump in his stupid antitrans bill.
Biologists are quite happy with using chromosomes to describe sex. Spoiler alert: there are more than two possibilities. Even with trump's stupid definition there are at least three.
Powerstruggle just trolls trans supportive posts for hours on end, judging by post history.
You're trying to reason with a bigot.