It's a nice idea, in that the punishment isn't pain, it's the removal of joy. But the whole idea of disciplinary punishment is whack. It's treating the symptom rather than the cause. They're not stabbing people with sporks for no reason. They're having a conflict, and stabbing is the last resort to resolve the conflict. Nobody wants to accept the fact that prisoners are in fact human beings, motivated by the same things every human being is motivated by. If you address those motivations, instead of just waiting for something bad to happen and reacting to it, you'll have less bad things happen. But that'll never change as long as prisons are a profit-making enterprise, and our system of justice and reform is just a punitive treadmill.

(as an aside: bland food won't work well on someone who lost their sense of smell from long covid, and prison populations were heavily affected)