The difference is that your examples are beliefs, based in bigotry, whereas gender critical feminists are merely stating facts.
For me, the problematic part of the judgment in the Maya Forstater case was that gender critical feminist views were characterised as beliefs. Protected beliefs, yes. Beliefs we are entitled to hold, and to express. Fine, whatever. But this shouldn't need to be protected, any more than expressing one's "belief" in gravity should need to be protected.
If anything, the belief that male people can become women is a belief that should be protected in law, in the sense that you shouldn't be discriminated against for holding it, the same way you should not be discriminated against for believing in God. But not being discriminated against for believing in God does not mean you get to force other people to believe in God. The same should be true of gender identity theory.
We should not even be having a debate about whether it's OK to say that trans women are male, or humans can't change sex. It isn't bigoted to state the truth, or acknowledge biological reality. (If it were, the Equality Act itself would be a bigoted piece of legislation.)
When politicians start trying to criminalise the speaking of truth, we truly are in 1984 territory.
This jaw droppingly insane piece of legislation needed shooting down in flames at the first opportunity. JK Rowling has proven herself more than equal to the task, and made the Scottish government look very stupid indeed.