Wasn't the legal sex/paperwork point being pressed by Mishal because of the Haldane judgement? Which would make anyone with a GRC legally that sex....? So presumably the Tories have to change the definition of sex and gender crystal clear.
I think she should have said (in that interview) that we are changing the EA wording to make sex mean biological sex, but gender reassignment is protected, so, if you hold a GRC or an amended birth certificate, then by definition your birth sex now reflects your acquired gender, not your sex - and you can be excluded legally from SS service providers and sports.
But I think the Haldane judgement is the sticking point and until the wording in the EA and GRA is made legally watertight, it's still going to be up for interpretation ...