I don’t think we know what the human mind would do in that situation, without a body or any sensory input.

And even if it did do something, the equivalent would be just running the LLM in a loop. And then I think it would definitely do something.

Well, eventually the operator of the mind would get hungry or thirsty, and start feeling around for water and food.

So for the comparison to be meaningful, you'd have to prompt the AI with a similar impetus.