Ah but one of the current TRA lines is that of course you can't actually change your biological sex, it's not biological sex it's gender identity that matters, so males with female gender identities should be considered as women for the purposes of single sex spaces etc.
Slippery, isn't it? It's as if they've realised that, thanks to science and biology and that kind of awkward factual stuff, they've lost the argument that TWAW are exactly the same as all other women - only a short time ago it was hateful transphobic bigotry to suggest that TW were in any way not the same as all other women.
So now they [some of them] concede that you can't actually change sex, but you can have a different gender identity. Whatever that is. Usefully, there's no test for it so TRAs can just assert its existence and demand special treatment for males with female gender identities.
That might work OK on Reddit, but on MN and in the UK Supreme Court, we need a bit more explanation of
'I am a woman because I have a female gender identity' than
'Because I say so, and anybody who doesn't accept what I say is a hate-fuelled transphobic bigot'.