Jeremy Stangroom

The very first claim in the piece - "As feminists we reject the TERF notion of a woman. That our gender and therefore our roles in society are determined by biology is a sexist idea that we have spent our lives rejecting" - shows they just don't understand basic feminist theory. https://twitter.com/glosswitch/status/999718178484834305 …

The proper claim is that gender is a hierarchical structure/system that ascribes certain roles, etc., to men and women, where these groups are defined by their distinctive biology as that is interpreted through the lens of a patriarchal system.

Biology counts because in a patriarchal society it's the ordering criterion - the basis upon which the gender division is constructed (to the disadvantage of female people - i.e., women). You can't escape the effects of that ordering. It permeates our lives from the world go.