Also a weightlifter (masters olympic weightlifting, nationally ranked). TRT and steroids are actually the opposite. Once you go off of them, your body starts to revert, muscle mass is lost, and often by more than you started with (because the body's natural production rates change with supplementation). It does take time, which is why sports regulatory bodies typically require specific time periods of hormonal therapy before they can participate, but their bodies will eventually adjust.
Sports regulatory bodies still test for hormonal PED, but their concerns have long swayed away from them because of the fact that they are so easy to detect and have the built in disadvantage of potentially altering your life negatively outside of sport. The current concerns have shifted to peptides and other forms of PEDs, because they are much harder to detect because they are 1) often naturally occurring but in smaller quantities, 2) don't actually directly act on the musculoskeletal system, but rather trigger natural processes that act on the system, and 3) often have half-lives dramatically shorter than most drug tests can even account for, and therefore require near continuous monitoring.
Agreed you lose your peak, however once a steroids user you will mostly retain more mass than a natural. It only takes a fraction of stimulus to retain mass versus adding it.
The extrapolation I'm making, and admitting it's an extrapolation, is that a sexed at birth male competing in womens sports will have had a developmental period of hormonal advantage over females which follows them regardless of gender identity.
So here’s the thing with that. My testosterone is in the cis female range. Has been for a while. I strength trained for years and even after having started estrogen. I continued going to the gym while on HRT and my capacity kept decreasing rather than increasing. So I looked into this. Because visibly I still had the muscles I’d gained. To actually activate said muscles, you need testosterone. That’s how it works. No testosterone = the muscles never activate = they atrophy away. While I looked the same in terms of muscles that I had while I was doing 12 pull-ups, I quickly came down to being able to do 0 unassisted. Now the visible bulk is also reducing because they just never get activated. A cis male on steroids still has testosterone after cessation. Hence the muscles they gained can retain stimulus for activation. I’ve been tracking my body comp through DEXA scans for years now and after starting HRT, within a year I was at the higher end of cis female muscle mass and had lost kilos of muscle throughout my body. Can I still beat most cis women at lifting? Yes. Only because I’m trained, not because I lived for years under heavier testosterone influence. I cannot outlift or outrun trained cis women, only untrained ones. I am unable to outlift my brother who is completely untrained. I used to be able to hold my own arm wrestling with cis men but now I know it’ll be foolish to even try it because even cis men with zero training ever have arms twice my size and active testosterone stimulus to be able to activate their muscles.