What about trans women who transitioned before puberty? What about cis or intersex women with elevated levels of testosterone? What about sports where it has been shown that after a long enough period of medical transition trans people have no significant advantage over their cis counterparts?

You appeal to science yet fail to cite a single source, so let me do it for you:

An individual’s sex does not determine their success or failure at any athletic event despite the high level of competition. This can be demonstrated when looking at not average outcomes, but the level of overlap among outcomes… While sex differences do develop following puberty, many of the sex differences are reduced, if not erased, over time by gender affirming hormone therapy.