And to be fair, just looking it up, yeah, shitty comments and all, but Fox spent like 25 years as a dude. The final part of your body to fully develop, generally the brain and for some reason some of the bones in your wrists(I think, please correct me if I'm wrong), are done by 23. Bone density and structure doesn't just disappear at that point, even after therapy. To a point, he has something to be listened to in that part of the shittiness. Hell, I think Rousey even said she didn't think there would be anything unfair about fighting someone that started the therapy before puberty and case-by-case otherwise. Of which Fox is a no for reasons other than trans-ient nature(haha bad puns), apparently she's not as good at fighting as she is at pulling her trans card, just going by comments surrounding that little snafu.
I really don't want to start a trans debate here either, so I think I'll just leave it at that.