Excellent this kind of case really needs to happen to publicise the issues. I've yet to hear from a TRA precisely how it is transphobic to group female people inclusive of all gender IDs, but it does seem to be.
A private girls school near me is working on its Stonewall gold award. I've often wondered if they would let my (fairly gnc, constantly miss-sexed) son sit the 11 plus? If not, would they let him sit it if he said special words? And if he says special words in the future, won't the narrative be that he was always she, so shouldn't they let him sit it on the off-chance?