I made this point earlier but because they have their way now, they can hide behind 'inconclusive' science (its not really inconclusive). Its just a flavor of science they choose to ignore because it doesn't agree with their politics. They will ignore videos like this one that shed light on how the development of transgender medicine isn't based on peer reviewed science at all.
https://www.youtube.com/watch?v=6mtQ1geeD_c
The burden of proof should absolutely be the promoters of trans women in FPO. It used to be simple, born a female = FPO eligible. Now there's extra layers of rules dependent on the quantity of pharmaceutical drugs someone is taking and for how long. This opens the door for lots of grey areas and the need for testing.
It also reduces athletic ability to one simple testable compound: testosterone. This is a gross oversimplification of athleticism. Why not keep it simple instead? Mixed divisions are your friend.
It is kind of ironic, for all the hating on white men*, they're fighting to have a few more divisions for them to be the best at. *(at birth!)