That's interesting, politics must be the most artificial goldfish bowl environment, especially on the Left, where to feel like you must be relevant, you must adjust your appeal to be "in" with people with views so contrary to the man in the street.
It fits the theory that Labour is now not a working class party but the party of the professional managerial classes PMCs, those that represent the OU witnesses looking to trash Jo Phoenix.
If I'm right and Labour indeed is the political party wing of the PMCs, then yes, fealty to GI is both the norm and expected of you.
Of course, the PMCs are the big part of the workings of civic life eg the civil service, and a Labour govt will need the PMCs to enact their program when in power, so now there will be unanimity for the first time of intersectional class analysis in the government creating laws and policies and the institutions executing those laws and policies.
Phillips and Nandy don't really care what the woman in the street thinks about trans policy, it's the application of Left policies as a govt, and that requires working with the PMCs in the civil service and other institutions.
They are who Labour, and the female (and male) MPs in Labour, now think about first, not mainstream GC citizens (80-90% of the population).