Thing is though they're not campaigning for a new law. They're campaigning for a "debate", which won't change anything.
If if the trans activists had their act together they'd have been campaigning for amendments to the Equality Act from the day of the judgement. For some reason they haven't done that and have resorted to sniping about how the judges are evil, trying to get the government to just ignore them etc. It's constitutionally illiterate. These people run off emotions and emotional arguments are really, really bad at anything that involves a modicum of intelligent thought.
This is, I imagine, largely imported from the American websites these people spend too much time on, because in America moaning about the Supreme Court not supporting your morally preferred position (what the constitution actually says is irrelevant) has been a national pastime of both right and left for decades.