Her so-called "concerns" have always had this central assumption: Cis women *feel* unsafe around people who *they perceive* are men. She accepts unquestionably these trans-exclusive cis perceptions of self-validity and safety + other-invalidity and threat. She just doesn't accept trans people's self-validating perceptions.
Helen Joyce's similar stance is manifest in a couple sentences on her book jacket: Operating by "[trans people's] feelings rather than facts" has "consequences," and "[cis] people are being shamed and silenced" for saying so.
Same basic thing. It's just supremacy about whose self-perceptions and feelings can be counted as "fact" or otherwise treated as something that matters.