OK sorry for the derail as I appreciate it's not your question exactly, but from Wiki
Transmen in sport
Kye Allums, basketball
Played on the women's team as transman and retired from sport shortly after leaving college.
Schuyler Bailar, swimming
Swam as a transman on the men's team.
Mack Beggs,[24] wrestling
Competes against women as a transman
Harrison Browne, ice hockey
Competed against women as a trans man
Balian Buschbaum,[25] pole vault
Competed against women as a woman
Willy De Bruijn, cycling
Competed against women as a transman
Zdeněk Koubek, track
Competed against women as a woman
Andreas Krieger, shot put
Competed against women while taking steroids as a woman.
Chris Mosier, triathlon
Competes against men as a transman (sponsored by Nike)
Erik Schinegger, skiing
Competed against women as a woman
Mark Weston, athletics
Competed against women as a woman
Patricio Manuel, Boxing
Competes against women as a trans man
So I just want to make the point there are only 2 transmen on that list competing against men, and neither are breaking men's records or sweeping up gold medals.
Transwomen in sport are virtually all also competing with women or they are listed as competing against men before transitioning.
Related to you post just above it is notable how many trans people in sport are listed despite the fact their sporting career was during their time before transitioning.
The reason why this is not a problem to me is because these people were always participating in the category aligned with their birth sex.
But yeah you're right some Olympians probably don't want to be outed if they transitioned after their career, there's a high chance there are more out there than just Jenner.