I take it the Red Truth can only assert things that are true in decohered consistent histories, not any of the values of the superposed state itself. So if the use of magic is reliant on an unknown quantity X from the fundamental level, then the presence of that quantity would appear in one of those superposed states. The Red Truth can't assert the value of either, mystery or fantasy, but only the constants of their effects.
I wouldn't call this a quantum physics element, it relies pretty much on a misunderstanding of how quantum physics works. But it is interesting as a plot and logical premise, makes a far more complex thought experiment than Schroedinger's Cat.
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