Language, Consciousness and Human Culture? Dennett often utilizes language in a conflationary sense. Here, he's not saying so much that consciousness doesn't exist, as that it does exist, but has the nature of an illusion. But the whole concept of illusion makes sense only with respect to subjective experience. So he's trying to sneak consciousness in by the back door, in order to dismiss it. Consider this excerpt from Foucault, on the inherent reality of the illusive:
Insofar as it is of the essence of the image to be taken for reality, it is reciprocally characteristic of reality that it can mimic the image....If illusion can appear as true as perception, perception in its turn can become the visible, unchallengeable truth of illusion. (Madness & Civilization)
Illusions are real only insofar as they are perceived. An atmospheric condition in the desert only becomes a mirage when it is seen. So if consciousness is in some sense illusory, it is also the reality which substantiates the illusion.