Earlier quoted context omitted.
That's a strawman. The steelman version is something like the following chain of reasoning: (a) gender identity is something that everyone has that is distinct from sex, (b) with enough introspection, everyone can discover their true gender identity, (c) if you don't have a strongly felt gender identity, you need to introspect, (d) if introspection does not yield certainty then this suggests genderfluidity, or even w…
I see your "how about" and raise you a [citation needed].
I will concede that if these things never happened, I personally would find the infohazard argument non-compelling, though others may have their own feared infohazards.
On the flip side, if hypothetically these were common ideas animating public school curricula and/or teacher behavior, would you consider that sufficient justification for homeschooling as being discussed here?