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If this veiw was correct nothing could prevent the demon from making an accurate prediction(including the stringent constraints of the thought experiment).

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What prevents you from accurately predicting the # the computer will print on the screen? Free will?

The fact is, the demon CAN predict what you will do -- it's just that by telling you in advance of your action, he is adding another cause into the equation. Just like entering a # into my computer program adds a cause in determining what # is printed on the screen.

I don't believe in fatalism, by the way. I think QM makes it impossible to accurately predict outcomes, but you can still accurately predict probabilities, as well as know exactly which variables would tip the scales even more in favor of whatever outcome you wanted.