You are talking about men and their unwillingness to speak with anyone opposed to them. Thats not a problem for any womens group to solve.
A womans group who supported the GRA but not self id would surely platform women who benefit from GRA. That would be relevant to the audience and their cause, wouldnt it?
What does the audience learn from a man who says he's against self id, but has a successful career promoting himself as a self id 'woman'? Its just a man saying 'do as i say, not what i do' at meetings about how bad self id is for women.
They never challenged him, only listened to him.