It's really quite narrowly scoped. There's no indication I could see that he doesn't still hold the same basically liberal politics (he included explicit disclaimers, for all the good that did); he might still be fine with transgender identity. He just wanted to talk about how the particular loudmouth brand of annoying leftist came to prominence. He even had a decent definition of them beyond "leftist I don't like", and put them in a broader context.
Even in the HN thread on the essay, it felt like hardly anyone actually read and understood it, just brought their own assumptions and intellectual allergies and let them run wild. It would be great if people could discuss these issues rationally, but the vast majority can't. Everyone is on a hair trigger.