It is obviously rage bait though. You don't have to know anything more than the article says to see it's just written to wind people up, it's not actually anyone else's business how trans people interact with HMRC, nor does it affect anyone else.
You could also have spent 2 seconds googling and you would have learned both that this is a longstanding policy and why it is in place.
I still think some trans identified people might feel they are being treated differently, because they don't have a GRC, because if they didn't know about the "special hotline" before, they probably will now. But, I guess that's their lookout.
Trans people through necessity are usually fully aware of the processes they need to go through to update their data and don't need The Telegraph to tell them about it.