It's not that he "falsely said" something. It doesn't even matter whether it's true or false and it's stupid to spend time debating whether he was right or wrong to say what he said. What he did by saying that was to give a rallying cry to whip up the fury of people who already believe in him. It doesn't matter if it's real, it just matters that they stay angry.
They intentionally planned it for when he was not even in the state.
I'm no assassin, but I am pretty sure if you are gunning for somebody, you don't make sure the target is somewhere else where there is zero possibility of them showing up while you are there.
