Nonsense. I can distinguish between men and women even though I am a woman and not some third sex. I do not have to be in some other state of existence to distinguish between conscious and unconscious.
Twyvel's basic assertions are:
1) Consciousness is not observable.
Not true. If consciousness is not observable, how is it that we can determine whether someone is conscious or unconscious, and even what level of consciousness they have? I can observe my own consciousness directly and the consciousnesses of other people and animals indirectly. Actually, most of our observations of the world are indirect: patterns of reflected light, acoustic waves, identification of chemical molecules, or interactions with surface molecules. The only things we observe directly are our own body states.
Most human beings have the capability to form mental images of things that we do not perceive with our own senses, either from descriptions by others, from memories, or by manipulating patterns to create new images. I can mentally "stand back" and "see" myself (my body, brain, and/or mind) as an object interacting with other objects. We can form mental images of our own brains, hearts, and consciousness even though we cannot "see" them directly because we know what other people's look like and that ours are virtually the same. While I have not seen traces of my brain waves, I have watched my own EKG in real time.
2) The ego/self does not exist but is a character in a dream/delusion.
This merely adds another level of complexity without providing any solution to the real problem. Twyvel has never answered the question of "who" created the dream/delusion, nor why, nor who it is that is deluded. If "I" do not exist, who is it that is aware of typing these words? My guess is that "I" am a pattern of energy produced by my brain, just as my typed words are a pattern of photons produced by the underlying computer programming acting on data received. My mind is as real - and as transient - as the words on this screen.
3) The observer can only observe itself as an object, but if it is an object something else must be observing it. This leads to an infinite regression of who observes the observer.
Nonsense. There is no "something else." How ironic that twyvel touts non-dualism but insists on this contrived dualism of subject and object. There is no infinite regression. That is a straw man invented by non-dualists and is refuted by the findings of science that show us the iterative process of body/brain states modified by sensory data and memories that produce consciousness.
If we take the stance that consciousness is an indefinable mystical experience that magically appears in our heads that human beings are incapable of understanding, we never will. But if we investigate it scientifically we find that specific structures in the brain produce the various forms of consciousness. With further investigation we will eventually find out exactly how these biochemical processes do indeed produce the experience of consciousness.
I highly recommend that you read "The Feeling of What Happens: Body and Emotion in the making of Consciousness" By Antonio Damasio.