They won't say it because Labour lied to us in the general election campaign and they want to continue lying to us because they think we're stupid.
During the 2024 campaign, Starmer had to be repeatedly, and vigorously, prompted by interviewers to agree that he believed women deserved 'safe spaces', he couldn't bring himself to stay 'single-sex spaces'.
Any time any interviewer, or female member of the pleb class, asked him about this issue, Stamer's face assumed the 'cat's bum/sucking on a slice of lemon', expression that he gets when he has to deal with uppity women. And he got positively and visibly peeved by having to frequently hear that women exist as a separate sex class and want their own rights and spaces.
When Labour realised this was an issue for their electability with female voters, they decided to soft-soap the electorate with reassurances that, 'they hear us', and they 'will do good things for women', if we would just elect them.
Lots of FWR knew they were lying on this issue, and others, and we discussed it here but were descended upon by lots of posters pushing the idea that there were back channels between women's groups and Labour, and that Starmer could be trusted to unleash his true gender critical inner self after being elected PM. We were told that Labour were champing at the bit to spend money on issues relevant to women like caring, schools, nursery provision, maternity care, domestic violence, and that if we wanted to see the public sector revitalised we had to vote Labour to ensure that would happen. If all else failed to persuade us to consider Labour, we were called cryptoTories 🙄
We knew it wasn't going to happen, we warned that it wasn't going to happen, and it didn't happen.