Again, no one (except possibly this Dr McKinnon) thinks men don't have an advantage over women.

What people here don't seem to get is that trans women, when following the IOC guidelines, don't perform the same as men. There isn't much data available, but the video below discusses the before and after transition effects on performance for both a cyclist and a runner. For those that can't be bothered to watch, IIRC the cyclist loses 11% of her power and the runner slows down by 12% (which, BTW mirrors the difference between men's and women's world records across all distances). This is admittedly, N=2 (or N=1+1 I guess) so take it with a grain of salt. But, in the absence of better data, it makes sense to look at the actual sporting results. Once again, trans women winning major competitions is not a common thing. Women's sport is in no danger currently.

The video also has a few different viewpoints on the issue. Dr McKinnon seems to be in the minority, even in the transgender community, about allowing trans women to compete against cisgendered women without restriction.