That you can imagine such means that the effort to afford a perfect illusion can be circumvented and therefore the illusion can no longer be perfect.
That you can imagine such is a statement only about our cognitive capacities, is it not?
A perfect illusion simply need not provide any EVIDENCE which would allow you to argue for or against it. I wouldn't call "the ability to imagine an illusion" ITSELF as evidence. Would you?
If you start touting "the ability to imagine" as evidence for something, then I think you're going to get on really shaky ground fast.
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