KL your boss is scared of you.
You're a genuine wild card. Your jobs gone, your package is negotiated and your reference written. But you're still there.
If he tried a disciplinary or comepetence precceding HR would laugh till they shat. At the very worst he could ask you to leave early.
So yeh he's scared. And all that meannes is bluff and bravado.
If you were to push him or undermine ever so slightly..
he'd jump like a kangaroo dropped on a trampoline from a great height.