after enough time at typical female hormone levels muscle mass generally decrease to be inline with cis women.
Muscle mass != strength though. Also someone that is physically larger isn't going to have their muscle mass shrink to that of someone that is a foot shorter.
but conceivably there are sports where transmen might be at an advantage, where a typically lighter smaller frame may be a win.
The complete abscense of trans men in male sports competitions says this isn't a thing.
There are also so few trans people competing at a competitive level that as someone who lives outside the american culture wars and tends not to give a shit about sport, it always seems like an such a waste of effort to make a drama out of it
"Drama" needs to be made out of it before it becomes the norm, and by "drama" I mean it needs to be assessed properly based on science, biology, and reality and have a decision reached for the future. Make no mistake - if trans women are allowed to compete with women in professional sport, and even at a high school level, eventually it will be just all trans women in the womens divisions with no "cis" women with the rate at which people are coming out as trans.
This is what's happening, and this is why trans women are being banned from competing in womens sports more and more the world over. Watching a alleged man beat up women with ease in the olympic boxing seems to have been the tipping point for most people that were still on the fence.