I don’t understand. The “joke” would be if there was no comma. Putting a comma seems like they wanted to cause panic, and feign ignorance later.
Yes, that's what he tried to argue (it was a joke bro) in the lawsuit that followed, to try to get back in. He lost.
Personally, I think he just flubbed it. At the time, memes like "I'm gonna cut you <line break> up some vegetables" were popular. Can't expect a dumbass edgelord to have good grammar.
Either way, it was a stupid thing to do and he paid for it.