Of course a trans panellist would not be welcome unless they were a de-transitioner
Miranda Yardley (invited to original Cornwall meeting and spoke at London one), Debbie Hayton, Kristina Harrison aren't trans?
Or do you just mean not the right kind? It is after all a meeting about women's rights. As pointed out, a trans person stood up and spoke at one of the meetings, and got to have their say. They boasted about depriving women of it. Hmmm. No comment.