The author engages in magical thinking. Our consciousness is a product of the physical processes occurring within our brains, specifically it's encoded in the patterns of neuron firings. We know this to be the case because we can observe direct impact on the conscious process when the brain is stimulated. For example, a few milligrams of a psychadelic drug can profoundly change the conscious experience.
Given that the conscious process is a result of an underlying physical process, it follows that these patterns could be expressed on a different substrate. There is absolutely no basis for the notion that an AI could not be conscious. In fact, there's every reason to believe that it would be if its underlying patterns mirrored those of a biological brain.