This is what Bannon said
Second term kicks off with firing Wray, firing Fauci. Now I actually want to go a step farther but I realize the president is a kind-hearted man and a good man.
I’d actually like to go back to the old times of Tudor England, I’d put the heads on pikes, right, I’d put them at the two corners of the White House as a warning to federal bureaucrats. You either get with the program or you’re gone — time to stop playing games.
Did Bannon Say He’d Put Fauci’s and FBI Director Wray's 'Heads on Pikes'? | Snopes.com
Bannon clearly distinguishes between “firing,” which is not enough for him, and “going a step farther” by “putting the heads on pikes,” which thus must mean something else
“Heads on pikes at the two corners of the White House as a warning” is not a metaphor or a joke