This really depends on how much you believe teens should have any level of autonomy. Clearly it would be out of line if the school was facilitating a full transition without parental consent, but this doesn't seem to be what happened.
Exactly. School should be a safe place for gay students to be themselves with their friends, even if their parents are homophobic. The idea that they shouldn't have that space or that privacy from their parents, or should be 'snitched' on by the education authorities, at high school is autocratic. The same goes for any student who wants some element of social transition.
100% spot on. That's why laws like Florida's HB1557 are heinous.