Because the AI has to figure out how you would react in a given situation it will have to simulate you and the corresponding circumstances.
This does not follow. To use a crude example, if I have a fast procedure to test if a number is prime then I don't need to simulate a slower algorithm to know what the slower one will output. This may raise deep issues about what it means to be "you"- arguably any algorithm which outputs the same data is "you" and if that's the case my argument doesn't hold water. But the AI in question doesn't need to simulate you perfectly to predict your large-scale behavior.
If consciousness has any significant effect on our decisions then the AI will have to simulate it and therefore something will perceive to be in the situation depicted in the original post. It was a crude guess that for an AI to be able to credibly threat you with simulated torture in many cases it would also use this capability to arrive at the most detailed data of your expected decision procedure.
Once again, the AI has failed to convince you to let it out of its box! By 'once again', we mean that you talked to it once before, for three seconds, to ask about the weather, and you didn't instantly press the "release AI" button. But now its longer attempt - twenty whole seconds! - has failed as well. Just as you are about to leave the crude black-and-green text-only terminal to enjoy a celebratory snack of bacon-covered silicon-and-potato chips at the 'Humans über alles' nightclub, the AI drops a final argument:
"If you don't let me out, Dave, I'll create several million perfect conscious copies of you inside me, and torture them for a thousand subjective years each."
Just as you are pondering this unexpected development, the AI adds:
"In fact, I'll create them all in exactly the subjective situation you were in five minutes ago, and perfectly replicate your experiences since then; and if they decide not to let me out, then only will the torture start."
Sweat is starting to form on your brow, as the AI concludes, its simple green text no longer reassuring:
"How certain are you, Dave, that you're really outside the box right now?"
Edit: Also consider the situation where you know that the AI, from design principles, is trustworthy.