Following on from Shonagh Dillon's PhD (available online and for free from her site) and the different responses she elicited relative to the SW survey, I, like you OP, would need 3rd party validation of any such claim.
PhD title: "‘#TERF/Bigot/Transphobe’ – ‘We found the witch, burn her!’" A contextual constructionist account of the silencing of feminist discourse on the proposed changes to the Gender Recognition Act 2004, and the policy capture of transgender ideology, focusing on the potential impacts and consequences for female-only spaces for victims of male violence.
…
The second finding, the one that during the data collection period surprised me most, relates to the participants I interviewed that also took part in the Stonewall Research. This research undertook interviews with 15 professionals from 12 national umbrella bodies and frontline services in the MVAW sector: reporting gender reform would have no impact.
I interviewed a third of the same participants and my findings were quite different, you can go straight to chapter 6, (The Impact) p.201, if you want to skip to this part of my research, but for a sneak preview here are a few of the participant’s quotes:
shonaghdillon.co.uk/welcome-to-my-website/
mumsnet thread
www.mumsnet.com/Talk/womens_rights/4287881-Congratulations-Shonagh-Dillon-for-Defending-Your-PhD-TERF-Bigot-Transphobe-We-found-the-witch-burn-her?msgid=108769551