If you look at the link I provided above you'll see an actual real example of top athletes "born female" who are being kicked out of competitions because of the exact shit that gets put in place to prevent hypothetical trans athletes from competing.

They're already out of top sport by virtue of not being able to compete against people who are actually at the top of the sport. Really we should be coming up with better ways to divide "top sport" than gender. Weight class, for example. Or just skill level/rankings regardless of gender and stop acting like #1 in both things is the same.