I'll be honest and say I find this stance really disheartening - it comes across petulant, short-sighted, hyperbolic and juvenile and does little to dispel the idea that the most extreme GC feminists care little about the lives of women, and I say that as someone who is 100% GC.
Broadly speaking, most parties are somewhat split on the issue. It was the Tories who put forward the proposed changes to the GRA. Most of the ire pointed at Labour is due to a few MPs who have muttered something about TWAW - I'm sure if you put some Tories under the spot, a lot would say something vaguely pro-trans rights.
I'm also of the view that the debate on trans-rights and the threats are exaggerated. The vast majority people know that women give birth, but as the same time, they want to be tolerant to people who want to transition. There are some horrible cases of women being attacked in prison by transwomen, but they're dwarfed by the numbers attacked by men in their homes or in the streets.
It honestly angers me that while I think this is an important issue, it seems to override everything to the detriment of policies that will actually improve the lives of women.