Because female sport is predicated on keeping male athletes out.
I agree, but I can already see the discourse play out in great detail, and I just don't have the patience for it.
Suffice it to say that it's the general rules of the IOC that need addressing, and any questioning of current athletes will just lead to the same responses: "you only question her because of her appearance" and "such medical data shouldn't be available to the public".
Of course, questioning the IOC will only lead to the same responses as well: "Only female athletes should compete in female sports!" IOC: "How do you know that isn't the case?"
Yep, it's an opt-out for me.