I resonate with this. I think some folks will object to the word "illusion" and it's connotations but I think it is resolved with:
1. Consciousness is a material thing (that we haven't found yet)
2. Consciousness is not a material thing (and therefore we cannot "find" it, and thus cannot be "known")
2 is the weirder proposition of course. It asserts a category of things that can't be conceived, but of course it feels like we are talking about it because we are using words to contain it. But of course, the words have no direct referent. That's the illusion.
1. Consciousness is a material thing (that we haven't found yet)
2. Consciousness is not a material thing (and therefore we cannot "find" it, and thus cannot be "known")
2 is the weirder proposition of course. It asserts a category of things that can't be conceived, but of course it feels like we are talking about it because we are using words to contain it. But of course, the words have no direct referent. That's the illusion.