I feel the author is comparing an abstract representation of the brain to a mechanical representation of a computer. This is not a fair or useful comparison. If a computer does not understand words, neither does your brain. While electromagnetic charge in the brain does not at all correspond with electromagnetic charge in a GPU, they do share an abstraction level, unlike words vs bits.
No, only a brain can "think" and be original. A computer is limited to what we input to it. An "AI" simply recapitulates what it was trained on.
Our brains are the product of the same dumb evolutionary process that made every other plant and animal and fungus and virus. We evolved from animals capable of only the most basic form of pattern recognition. Humans in the absence of education are not capable of even the most basic reasoning. It took us untold thousands of years to figure out that “try things and measure if it works” is a good way to learn about the world. An intelligent species would be able to figure things out by itself our ancestors, who have the same brain architecture we do, were not able to figure anything out for generation after generation. So much for our ability to do original independent thinking.