The idea that women who have spent all their lives being anti regressive sex stereotypes (such as "real women adhere to patriarchal ideas of 'femininity'") police other women on the basis of their adherence to... regressive sex stereotypes such as patriarchal ideas of 'femininity' , beggars belief.
That isn't what "gender critical" is. "Gender" = regressive sex stereotypes (like "women must be feminine" "ladybrain" "pink for girls", "women are naturally submissive/like cooking/are good at typing/bad drivers") that sort of rubbish. "Critical" = critical of that. Not supportive of that. Literally the ONLY criteria for being female is being actually, biologically female. It's nothing to do with such backwards ideas about "femininity". Males, regardless of outfit, hairstyle, likes, dislikes, personality can't be female, because they will always be biologically male. Human personalities are much freer and wide ranging than limiting "gender" boxes.
Meanwhile, the trans movement and its ideology is ENTIRELY built on the same regressive sex stereotypes that feminists critical of "gender" (which is a central tenet of feminism, or was back in the day) have been fighting for years and thought we'd got rid of in, oh, about the 1980s at the latest. But nope.
There appears to be some confusion. Some of it quite deliberate, I'd say.