Just because we have difficulty defining consciousness doesn't mean we have difficulty distinguishing or classifying it. We can't give a final definition for life, intelligence or disease, but that doesn't mean everything is equally alive, intelligent and diseased.

Your list of requirements is implying that, because we lack a perfect definition for consciousness, LLMs are conscious too. That's malarkey. It may be that they could one day become conscious, but it's not because we can't fully define what human consciousness is.