I hate the guy, but TBH when I saw the tweet I just thought "Little baby can't even muster up some courage to show up, and he's throwing more tantrum... par for the course for him."

But now as I write this, I do realize, he didn't need to announce his no-show 12 days beforehand, he can just quietly not show up on the day, so this tweet does seem to be more of a signal to... well, incredibly, it's a signal for the members of his cult that they can attack the inauguration!