yeah I feel its just mixing things though to point to these might have beens. The modern movement to me is individuals as adults (mostly) determining what their gender is which is defined as not the same as their sex. This is my understanding but im never really sure if I have something like this as you sorta have to belong to the culture to really understand it. I belong to my own and you will even get debate within a group about what it means to be part of it as cultures are almost constantly in a state of redefining even if core elements remain the same. So anyway the phrase there are examples of trans (presumably like the modern movement) having existed is different than the phrase there are examples where its theorized that trans individuals might have existed in history.