I think it's also because Olympic sport, can't be hidden away and obfuscated with nonsense language. It will be on prime time TV, pictures of Hubbard will be in all the press.
We don't see the assaults happening in prisons, in refuges. All the ways that women are disadvantaged are not generally broadcast. This will be.
It's also because Hubbard is not a Blaire White type of trans person. Men especially (and probably some women) find it easy enough to hand wave away inherent problems to women if the person is a close enough approximation of femininity.
I doubt Hubbard is who TRAs would choose as their first major representative on the Olympic world stage and certainly not in a sport like weightlifting.