It was blatantly a joke. The article even gives us the context that it was part of the guy deliberately getting himself banned from that instance.

> It was a guy basically running harassment enterprise, including swatting people and other false flag style crimes.

Sure, maybe (if it even was that guy and not some random unrelated joker). But even people doing that can also still joke.

> He wasn't being silly or lampooning anything or creating satire

He absolutely was. "I will leave my fingerprints and DNA behind so they can catch me"? That's really funny.