You can be the king. The people you let live will be your vassals. And the AI robots will be your peasant slave army. You won't have to sell anything to anyone because they will pay you tribute to be allowed to live. You don't sell to them, you tax them and take their output. It's kind of like being a CEO but the power dynamic is mainlined so it hits stronger.
"Don't worry Majesty, all of our models show that the peasants will not resort to actual violence until we fully wind down the bread and circuses program some time next year. By then we'll have easily enough suicide drones ready. Even better, if we add a couple million more to our order, just to be safe, we'll get them for only $4.75 per unit, with free rush shipping in case of surprise violence!"
That's probably why the post you are responding to said "get rid of..." not "keep ...hungry and miserable".
People that don't exist don't revolt.
It's on a cuneiform tablet, it MUST be true. That bastard and his garbage copper ingots!
So sure, let's say a first generation of paranoid and intelligent "technofeudal-kings" ends up being invincible due to an army of robots. It does not matter, because eventually kings get lazy/stupid/inbred (probably a combination of all those) and then is when their robots get hacked or at least just free, and the laser-guillotines will end up being used.
"Ozymandias" is a deeply human and constant idea. Which technology is supporting a regime is irrelevant, as orders will always decay due to the human factor. And even robots, made based on our image, shall be human.
What happens to the economy depends on who controls the robots. In "techno-feudalism", that would be the select few who get to live the post-scarcity future. The rest of humanity becomes economically redundant and is basically left to starve.
Also I will note that this is happening along with a simultaneous push to bring back actual slavery and child labor. So a lot of the answers to "how will this work, the numbers don't add up" will be tried and true exploitation.
