Trans people shouldn't be in sports, period.
When you're regularly taking hormones and changing your body chemistry, it's nothing short of doping.
The "statistics" that "experts" lean on are the outcomes of trans athletes in their selected gender.
Except that doesn't matter.
A fat trans woman cannot outrun a fit woman. With less training and less skill, obviously some trans athletes would underperform.
Not making use of sex-based advantages doesn't mean those advantages don't exist.