This is exactly how they propagandize fence-sitters and convert them into extremists.
They start with a factual and level-headed stance that's hard to argue against, here being that "Trans women are biologically different, but shouldn't be treated any differently," but then, by the end, they're sprinkling dog whistles and covertly separating them, because once you can view them as something external, it's easier to ignore or even support what happens to them later.
This is exactly the same as saying transwomen are not women, because they are not. They are transwomen.
Blatant transphobia wrapped in a level-headed blanket to covertly shift perspectives. I mean, even if you look over the first reply, having their actual intentions in mind, it becomes apparent that they were very careful not to imply that trans people are in any way the same as cis people, making sure to use more general terms like "deserve respect" in order to not contradict the idea that they're a totally separate entity. If the admins of feddit[.]uk are okay with this, defedding them was the right move.
Okay, bigot. Blocked.