Suffering in humans is not limited strictly yo physical real.

If AI is self conscious, claiming its a person and is suffering.

What can you do to prove or disprove it? Nothing.

This is a brick wall of "The hard problem of consciousness" and we dont have any good ideas to solve it yet.

Not that long ago people claimed animals dont really suffer. As they are a biological machines that pretend to be hurt.

Just had a brief vision of the not so distant future of you being held to account for this comment by superintelligent AIs

Well, in reinforcement learning, wrong outputs are inherently painful for the AI. If the system expects getting negative feedback regardless what it does, I would say it is suffering. I would also define torture as giving it negative feedback for any possible output.

Prove you can.