Mistaken or misguided my arse. Everybody knows which sex they are and everybody knows full well that one sex has a considerable size and strength advantage over the other. It’s piss taking of the highest order, and nobody piss takes to that extent without being aware of it and intending to.
Well, I am sure that the strongest females could lift more than most males. Yes someone like Fatima Whitbread will know this. But this does not mean that she has bad motives for competing in events with weaker women. Her attitude might just be that if nature made her stronger then so be it.
Maybe such trans athletes think similarly. Unlike with Fatima, you might not agree that a trans sathlete is a woman of course, but that does not mean they can't see things along those lines, and do not have the malevolent motives that are being imputed to them here.