Let me clarify. I mean consciousness as experience. Not thinking, not feeling, not memories, but the raw experience that is always happening here and now. When you used the word "perceive" I interpreted that as a tacit admission that experience does exist. It's the same for any quale: warmth, cold, anxiety, fear, desire. You can argue that they represent facets of computation but you would not deny that you feel them. They are real for you. Why is that? Is 4 real for a calculator like friction on my skin is real to me? Thomas Nagel asked, "What's it like to be a bat?" Nagel asserts that "an organism has conscious mental states if and only if there is something that it is like to be that organism—something it is like for the organism." (https://en.wikipedia.org/wiki/What_Is_It_Like_to_Be_a_Bat%3F).
The idea of an illusion of consciousness implies that there is consciousness. Without consciousness, there would be no illusion.