Labour have responded to the JKR article - this from the BBC's coverage:
We can now bring you the latest comments from the Labour Party, which begins by saying that it "is the party of women's equality, with a manifesto that puts women front and centre".
"Sex and gender are different, as Labour's Equality Act makes clear," the statement continues, "that's why we have consistently said that we will not introduce self ID and that we will protect single sex spaces for biological women".
BBC piece
This seems pretty clear to me, and is what has been said before. But it's not getting through and the question isn't going away , and I think that's because Starmer himself has not made a clear statement (although he has burbled through something similar) - he just needs to do that simple thing, as RedToothBrush and MrsOvertonsWindow said earlier.