Shouldn't there be room for discretion if teachers feel like telling parents puts the child at risk of harm?
This is assuming it's akin to a sexual orientation; this is a mental health condition with (currently) the potential for serious life changing medical interventions.
There's no other health condition that would result in teachers not informing parents.
I'm assuming that exceptions may be around those who are under GIDs and it's deemed appropriate? (Perhaps part of the trials?)