Yeah I would go with that, I think reading that page there's unreliable info and also that they don't seem too bright, after making that claim they then draw the conclusion that "biological sex matters. The law agrees" What law? Nothing has been passed yet.
Seems on this occasion they were right, Amber Rudd confirmed the exemption within the the Equalities Act is not going to be touched on the Andrew Marr show last week (right at the end).