Would it be proper to deny a transgendered person the ability to fight against other people who belong to the newly re-assigned sex? Does it make a difference that the case in the video involves a male to female transgendered person who now competes in rather violent sport of mixed martial Arts?

Transgendered person

Would it be proper to deny a transgendered person the ability to fight against other people who belong to the newly re-assigned sex? Does it make a difference that the case in the video involves a male to female transgendered person who now competes in rather violent sport of mixed martial Arts? Does such a person have an unfair advantage or is there any potential risk involved?