(changed name from rb67)
This document seems to imply a GRC is irrelevant and therefore that the Gender Recognition Act is irrelevant: if someone identifies as a different biological sex (referred to as "gender") then that should be respected regardless.
It is difficult to argue against changes to the GRA if those changes have already been accepted. It seems the argument has taken place behind closed doors and self id here.
The word cis is used to refer to women. Most women have never even heard of this word never mind accept it as a reality. If we accept cis we also have to accept the trans activist agenda. It is important this word is not accepted into the mainstream; its inclusion indicates that is happening.
Someone in the legal "system" may make up their own mind. A person working in an HR department who receives a complaint quoting this type of document will not have that confidence. See what appears to be the absolute terror felt by political parties, Swim England, the BACP, most of the media.
It may not be law or guidance but it is the type of document that helps build argument.