There was nothing like that in the HP books because the HP books were written by someone who is extremely anti-trans. It sounds like (although I've not played it) they put a trans character in to distance themselves from the IP holder's views. It's not really that they forced it there, they put one there to signify that they aren't about that...

Then from what I understand put a bunch of anti-Semitic shit in their game. Either way, I can't recommend picking up Hogwarts Legacy. The IP seems shallow, the ideals that the game pushes seem toxic, the IP's ideals seem toxic, and overall, there are better things to spend money on than toxic AF people.