The book fits into the current unknown-unknowns world of rapidly increasing machine-learning capabilities across most domains where there is little evidence to suggest that "intelligence" is limited to the human limit (which is already quite high relative to the 99.9th percentile; we get a few Einstein, Von Neumann, Turing class people in a century) or the human body.
So, they say, computers are not smart now, we don’t know what intelligence is, we don’t know how to make computers smart, but they certainly will be intelligent soon.
There is currently a trillion-dollar corporation whose valuation largely rests on their progress in solving this. It is beyond asinine to require it from a book, as though it were table stakes for discussion.Rationalists don't need pesky things like data or evidence to assert their desired conclusions as fact. Don't you know, you can assert your vibes as science, now.