Is not the ego the illusion of individuality?
the ego the illusion of reality? Or is the ego the very definition of reality?
You have a source to back up this unusual concept?
In spirituality, and especially nondual, mystical and eastern meditative traditions, individual existence is often described as a kind of illusion. This "sense of doership" or sense of individual existence is that part which believes it is the human being, and believes it must fight for itself in the world, is ultimately unaware and unconscious of its own true nature.
I don't give much credence to "mystical and eastern meditative traditions"