The problem with the argument of the pro-trans atheletes side is they're talking out of both sides of their mouth.
On the one hand they say that transitioning is NOT a great devastation to the body going through puberty; on the other, they say that transitioning is SUCH a devastation to the body that the male-born transathletes have depleted themselves of all attributes that would give an athletic advantage.
You can't have a discussion with someone who wants to accept something as a truth AND refute it at the same time.