Repeatedly explained.
The context for women who identify as men in some contexts being denied entry to a women's facility was, in the judgment, referring to a support group for sex abuse survivors, where anyone with a gram of sense and compassion would grasp that traumatised women might not do well talking about and re experiencing such things with someone there who looks very male. It comes with a note that in such cases an additional facility would need to be provided for the women who identify as men, because obviously they have an equal need for an accessible service. Note that this nowhere included the command that they should be cast out like orphans in the storm and sent up chimneys. It did not refer to general public toilets.
I'll repeat that again slowly: It did not refer to general public toilets .
It's a nice gotcha, but again, it's about men weaponising women who may look male in order to try and punish women and escape having to respect the need of, in this case traumatised women wanting help with their abuse, to have a space away from men who for some unfathomable reason really, really demand to be there when non consenting distressed women are talking about their sexual trauma. Can't think why they'd want to. Gosh it's a puzzler.
as clearly what you look like does matter in the guidance.
Re read the guidance, the explanation is there that sex based is necessary as you cannot go on what people look like. Unless of course you want to try and throw smoke so that you achieve a goal that traumatised women cannot escape men.
There is a call for more unisex spaces, although does that mean every single place that offers toilets or changing facilities will need to update their infrastructure? How plausible is that and how long would it take to provide those spaces?
Not women's problem.
Nor a reason to let men use women's spaces.
And keep in mind, women who could not use spaces where men with trans identities were present were just expected to go without provision and shut up about it or else. Women have managed the situation of having to unhappily use mixed sex provision in which they felt unsafe and without dignity and sometimes encountered actual harassment and assault (see court cases) for years while they tirelessly fought this battle. They had no choice, they had no compassion from anyone, and no one was ever planning to come to the rescue with third spaces. Men are going to manage for the short time it takes. They can hack it like women had to. Women don't have a magic 'cope' gene on the XX chromosomes.