I agree with you that these people are being ridiculous. But they aren’t the moderators (or even if the moderators personally believe that, they aren’t moderating accordingly).
Andy outlined exactly how you can make the point you want to make without running afoul of the rules.
That doesn’t mean the rules are perfect; for example, I think that if “trans women are biologically male” is banned, which is fine, then the argument “trans women belong in women’s sports because they are women” should also be banned, because that argument is tautological and serves no purpose but to invite contention over the forbidden question of whether or not trans women are women.
But that quibble with the rules doesn’t prevent you from expressing disagreement with the inclusion of trans women in women’s sports, or any other women’s space.