It is interesting, really, that 'voyeurism' is a paraphilia and depends on the non-consensual participation of 'erotic targets'.
But it also depends, legally, on intent being proven. (UK law, not so sure about US).
A male in a changing room staring at women and girls is highly likely to be setting off lots of red flags.
A woman in a changing room staring at women and girls sounds far less dangerous, doesn't it?
In the situation of a male who identifies as a woman, we are now according to TWAW, placed in the second situation. With the added proviso that any accusations of said male, any suspicions raised or questions asked are going to be called bigotry and prejudice.
Gosh, that looks like an attractive loophole that any predatory male will be looking closely at, doesn't it?
Almost all paraphilias occur in males. 99% of sexual assault/rape is committed by males. There is a reason women's single sex spaces are safer for women.