Martina has a rational argumemt against trans women competing in sports where their biological gender in childhood and youth would give them advantages in muscle mass, joint leverage, fast-twitch fibers, and bone density that remain even after their transition.
Such differences are greater than natural variation between individals in a gender (e.g. Michael Phelps and his lactic acid metabolism relative to average male swimmers).
That doesn't mean she doesn't back LGBT rights. Her position regarding competitive sports is no different than the idea that boxing should have weight classes. There are sports where a trans woman would present a size and muscle disparity that would result in physical injury to cis-females. It's not transphobic, but common sense. And what does any of this have to do with locker room usage? Red, you're obfuscating per usual.