An illusion is still something undergone: to say experience is mere appearance is to reassert it while believing one denies it.

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Strawson · "The Consciousness Deniers" · 2018

An illusion is what seems otherwise than it is: the stick seems broken in water, it is not. The concept therefore always presupposes two terms, a seeming and a being, and the gap between them.
But in the case of experience, the seeming is precisely what is at issue: that pain seems painful to me already is the pain. There is no room for a gap between suffering and its seeming to be suffering.
To say that the brain itself as having an experience it does not have is thus to describe a state in which something is present to someone: precisely what was to be eliminated.
Everything else can be granted: that introspection deceives us about the richness of the visual field, about our motives, about the nature of our states. Those errors bear on the description of experience, and they presuppose that there is something to describe badly.

Therefore Illusionism can correct the idea we form of experience; it cannot cancel it, for the illusion it invokes is already a form of it.

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with it: it is the one fact I cannot doubt.

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