The Forstater judgment sets out what 'gender critical belief' means in terms of legal protection in the EA.
The original judgment said:
"The core of the Claimant's belief is that sex is biologically immutable. There are only two sexes, male and female. She considers this is a material reality. Men are adult males. Women are adult females. There is no possibility of any sex in between male and female; or that is a person is neither male nor female. It is impossible to change sex. Males are people with the type of body which, if all things are working, are able to produce male gametes (sperm). Females have the type of body which, if all things are working, is able to produce female gametes (ova), and gestate a pregnancy. It is sex that is fundamentally important, rather than “gender”, “gender identity” or “gender expression”. She will not accept in any circumstances that a trans woman is in reality a woman or that a trans man is a man. That is the belief that the Claimant holds.”
The appeal judge said, 'We refer in this judgment to that belief as the “gender-critical belief”' and the judge upheld the appeal.
https://www.bailii.org/uk/cases/UKEAT/2021/0105_20_1006.html
This is 'gender-critical belief' as protected in UK law. It's not particularly a feminist belief, or a belief at all, it's just stating facts. It's arguably a belief that it's sex which is fundamentally important, rather than gender, but that's all.
Matt Walsh would absolutely be protected for sharing these 'gender critical' beliefs in the UK and I'm completely fine with that. I don't think anyone should be discriminated against for stating facts about sex even if they are an arsehole in many other ways.
As we have all seen, it is mostly women losing their jobs and it is the most vulnerable women, girls and children who are harmed when women are prevented from speaking up. So I don't care if it's not technically a 'belief'. I think Maya Forstater's ET was a superb practical thing to do which has made a huge difference, not only to women's employment rights, but also to the safety of children and vulnerable adults - because the women who speak up for them can no longer be sacked with impunity.