Looking it up, its apparently only $35 to keep it active every year, so even if he's not working it would be wise to keep that up even as a fallback.
But that does in fact list an employer, so he's probably still doing it. And given he tweets a million hours a day, likely something he can do from home. And that's fine, not going to fault a guy for having a job. If I only sold a dozen or so books a year I'd have to have a job too to keep up my bitch tits so they don't turn into flaps like Ralph's.