Adding a content warning to the account/post seems about right to me. Someone that creates an account just to immediately post something like this is very likely not following the community guidelines.
It's not like it was posted with any research, or as an opinion, or even on a thread on that topic. It's unlikely to have been posted with any altruistic intentions. It's much more likely to have been posted from a base of hate and with the intent to cause harm.
Heck, that you have an issue with this and think that it is 'extreme censorship' makes me much more likely to be suspect of your intention behind future posts here. That you frame this action as being 'banned' when the account wasn't actually banned only adds to that.
You really shouldn't go through a stranger's posting history out of frustration. In any event, the account has most probably been flagged, and the content immediately flagged and hidden. Were they to continue posting in the same vein, they would be banned. Oh, wait... there have been accounts banned (yes, banned[0][1]) for posting that men should not be in women sports or writing other reasonable, similar comments. You shouldn't believe anything legacy media, professional politicians, and corporations tell you, huh? I guess seething at someone so much because they're ignoring you for not being too bright that you have to go check their history in order to ridiculously try to "well, actually" them is not something sane or intelligent people do. You're just not doing yourself any favors here in terms of how you're perceived.
I'm sorry you had to go through such a horrible experience @EndWokeness, but you could have stated an actual biological fact by posting "There are only two sexes", even if there are corner cases.
This week I've started to see new users that post flamebait, gore, or even child porn in BlueSky. These get banned quickly, but I can't fathom what's the psychological necessity of people like you following the "wokes" to a new platform when they just left X to be out of your way.
Since gender is a social construct with no physical meaning it means he isn't wrong, everyone is allowed to decide how many genders there are in their own mind. His social construct just has 2 genders, others might have more.
