All I see is another progressive organisation that has been infiltrated by TERFs. The page you link too reeks of their tactics and arguments. The fact they're based on TERF Island (UK) says a lot as well.

For the women involved that aren't TERFs, I think it can be all too easy to subscribe to their arguments when you've worked so hard to achieve fairness and equality. But the conflation of trans women and cis men as equals, without any scientific proof, leads me to believe that even they are being deceptive here. I mean, the TERF tactic of denying trans men their identities also shows up towards the end:

Transgender men and boys, or non-binary women and girls, who do not take hormones or who have not undergone any form of medical transition, share the same physiological features as biological women and therefore should be welcomed in the female category.

Like, I'm sorry, but I don't think it's fair to use people who dislike trans people to prove your point. You're fair and reasonable to not want to open that can of worms. All I'm saying is that finding a definitively anti-transgender reference doesn't prove your point, because there's no way to seperate the TERF from the science in that article. Meanwhile, I have never seen an Olympic-class athlete complain about transgender women in sports until Angela Carini. And even she has turned around and profusely apologised for what she said:

"It wasn't something I intended to do," Carini said. "Actually, I want to apologise to her and everyone else. I was angry because my Olympics had gone up in smoke."

She added that if she met Khelif again, she would "embrace her".

So, I dunno, I don't really think you've disproven that claim at all.