@Frothy I understand that you have been doing the hard work of running the page. I respect that you can set the policy, and ban whomever you want, including me.
As I understand it, your page built on a campaign started on Mumsnet (“we believe you”)? And some people who were part of that campaign, and supported your page, are now excluded from it 
As a compromise, would you consider changing your name to “I believe them,” so women understand the nature of the page and can stay away if that is safer for them?
I respect your TW- inclusive stance but many, many survivors of rape will be traumatised by “her penis” etc.
If you are excluding a group of women, the kindest thing to do is make that clear upfront, which the name change would help.
Also, it would make it less painful for the Mumsnetters now blocked from the page, because your page is then distinguished from the MN campaign which preceded it.
I can see you are a kind person who wants to help people.