@EdgeOfACoin
TRAs occasionally like to play the game "well, if you let transmen into women's spaces, then what if a man decides to pose as a transman!?!?"
It's interesting, isn't it. On the whole, I tend to think that ftm transitioners pass as biological men far better than mtf transitioners pass as biological women. But that's when they are fully clothed.
Having seen that picture, I really would not have any concerns about sharing a changing room with a ftm transitioner.
And actually, the 'well where should a transman change then' question was one I used to ponder when I was newer to this debate.
I think we subconsciously have a default view, to a woman we instantly recognize something thats not us more, i.e transwomen, but we may think a transman looks more normal because our default view is woman so we dont see it as much.
I once had a conversation with a gay man about Page which led me to this conclusion (when Page was posting pictures up of mastectomy and ab implants) we both discussed why it did not look attractive to either of us, him being gay and me being straight we both agreed on the same things, nipples too high, wrist didn't look right too long in the body, arms proportionately too thin etc, he drew attention to the face, things I didnt see, I thought Page just passed as young boyish looking face, he didnt he pointed out features I thought were normal.