Hate is some strong editorializing. He hasn't made any statements against Bluesky. All he's done is encouraged people to stay on Twitter after Musk initially took over. Internet denizens saw that as anti-Bluesky. He's never actually publicly critiqued Bluesky

My opinion: he's probably trying to avoid legal trouble that would come from propping up a Twitter competitor after making a major sale. Especially one that was initially conceived within Twitter itself