https://www.bbc.com/sport/46453958
I intentionally looked up an article that disagreed with my premise and found this. It talks about a cyclist criticized when she won an event . She rightfully points out that she lost to those same opponents in ten out of the previous eleven events before winning this one.
She was also competing in the 40-something age category and I believe had transgendered quite a long time before and provably had no more natural muscle mass or bone density than the average woman. Any extra muscle mass was provably a result of exercise.
With the Fallon Fox situation, she had transgendered only two years before the MMA fighting and still had pretty much all of the muscle mass and bone density from before. Add that she wasn't that skilled but muscled her way to wins over much more skilled opponents.
Granted it is more complex and debatable than I originally thought.
Apparently, and I don't know if this is true, African-American women tend to have thicker bones than other races and this was once used as an excuse to exclude them from sports. One of the excuses used to exclude black people from baseball was something about having a longer heel bone that gave some sort of an advantage. In fact, Fallon Fox used that as an example of bigotry in the past. Of course, just as her opponent might be making excuses for losing, Fallon Fox might be drawing a false equivalency and playing down an unfair advantage.
But, yes, it gets far too complex to make one size fits all judgements and, on the greater social scale of how a lot of bigots will use the situation, it is far more important to support and defend people who are TG as a group.