Sorry not time to read comments made so far, but the article fails to spell out what the change was.
This was when the EA was written to bring together all the equality laws under one (hate to us this word) umbrella.
And in compiling this into one unified law, the politicians decided that one protected characteristic, sex could be made subservient to another (gender re-assignment) ie creating the concept of "legal women" as well as women (biological).
Whether those who wrote the law did this deliberately (to my mind it is social engineering to use the law to impose a belief set on everyone), or because they thought women just wont mind and anyway we have given them the SSE, makes not difference, because whatever the reason, it became the trojan horse.
And of course following on from that the misinterpretation of the law by Stonewall etc. to insist the self identification had the same status as a GRC.
I have no doubt that in the early days, given the very limited number of men who had transitioned surgically and got a GRC were by and large if not treated well, not harassed or worse.
But they are very different to the situation nowadays where a man can just claim they are now a woman and claim they have the right to be in women's toilets, sport etc..
Yes rights can be taken away.
As women slowly came to realise how the new all encompassing EA had far from making sex a protected characteristic in its own right, was only a right conditional of the rights given by the GRA.
As said on many other threads, if early transitioners and modern day identifiers want to be angry, but angry with the actual law makers and the queer campaigners who have steadily infiltrated campaigns and work places to under mine "norms".
The law makers promised something that was not real. That having a GRC = being a biological woman.
And the campaigners claimed something that was not real. That just by identifying you can magical deny the reality of your biological sex.