Claims

The brain operates as a prediction machine: it constantly makes predictions about the causes of sensory signals and updates these predictions based on sensory input; all conscious experience (perception of world, self, free will, emotion) is a form of controlled hallucination grounded in prediction and physiological regulation of the body.

The brain is a system where what it does cannot be cleanly separated from what it is: neuronal firing communicates with other neurons but also removes metabolic waste; replicating all this in silicon is physically impossible, analogous to trying to build the Brooklyn Bridge out of string cheese.

All major theories of consciousness that try to explain why brains are conscious arrive at the same properties (integrated electrical networks, neurotransmitters, ion channels) that exist throughout the entire human body, not just the brain; therefore these theories cannot explain why the brain should be conscious and other tissues should not.