This gender debate (err, rather defamation) happening in Paris 2024, seems to blur the argument of sex being binary, doesn't it?
This AP news article on sex testing discusses nuances and conditions that can affect athletes who in most ways are considered biologically female but may exceed arbitrary conditions set by governing bodies.
So, without surprise, things really aren't as simple as transphobes believe. Maybe men/women aren't the best differentiations for sports.
https://apnews.com/article/sex-eligibility-tests-female-athletes-07572d23d409126a8e069cb0bced1706