Of course there's a lot of hypocrisy with this.
Imagine seeing this person in the loos after winning the event? He could legitimately say "well I am a woman because you let me win the beauty pageant", you can't then say "well I don't care about beauty pageants, but I care about this now". I can imagine the headlines "Outrage over transgender beauty pageant winner using women's toilets".
Or imagine those girls who missed out, you can't say to them "well if he was swimming against you I would have a massive problem with it, but because it's a beauty pageant I don't care".
This person can't even be considered attractive, so he hasn't won it on the basis of looks, only because of the trans card. So it's even worse than competitive sports.