As I said, NCAA stats have lest than 10 trans women athletes out of a total of 500,000 athletes and most of them aren't winning championships.There are surely a few Trans athletes ratio but how many biological male Trans athletes are excelling on women's sports? That's the onus. I will bet all my assets there is no biological female excelling on men's sports....
You can make a fair argument about the fairness of that swimmer swimming as a guy one season and a woman the next but other trans people have been on puberty blockers since childhood and wouldn't have had any of the impacts of male puberty.