Laurel Hubbard (MtF) was on New Zealand's Olympic weightlifting team. An Indigenous Maori girl missed out because of that.
There's countless examples of athletes who were totally uncompetitive as males, suddenly becoming elite-level after transitioning. If that doesn't say male advantage I don't know what does.
But it's not just the competitive aspect. It may be offensive to say, I know, but some women actually feel uncomfortable in a change room with large 6'1" men and their penises.