The problem for this argument is that there is no actual data that trans kids and specifically trans girls are any better at sport than other girls.
Literally no trans athletes winning anything. I think hacker news skews scientific so we can do the math, if say 1% of the athletes are trans we would expect them to win 1% of the medals in a fair contest. As it is, they don't even come anywhere close. There has not been a single olympic medal won by a trans athlete, so clearly they do not have some kind of magical advantage, in fact (and common sense would make this pretty obvious) they seem to have quite a statistical disadvantage.
> The problem for this argument is that there is no actual data that trans kids and specifically trans girls are any better at sport than other girls.
There is considerable evidence that they aren't. But that's not really relevant, because you have to remember segregation in sport has never been about competitive fairness, it has always been about allowing those who are socially superior to avoid the embarrassment of having to compete in an environment where they might be defeated by their social inferiors.
It is why women were long banned from competitions, and then shortly after exclusion seemed to harsh for evolving attitudes, they were segregated from men. And it is why trans people are being excluded from competition now. It's why racial segregation in sport was a thing. When competitive fairness is raised as an argument for segregation, it is pretextual, not the real reason, so counterevidence is irrelevant.