It's another round of "humans must be special, right?" The author comes close to admitting this: "As intelligent, social entities, we decide (or, to some degree, our evolutionary history has decided for us) which other entities we regard as having inner lives and being worthy of care." Then he works backwards from that towards a definition of consciousness that makes humans special.
AI forces us to confront an issue that's often come up in science fiction - when you encounter a new kind of creature, how do you decide if they are sentient? What rights do they have? How do you get along with such different creatures? This historically hasn't been a problem on Earth, because there's such a big jump between humans and the rest of the primates or the dolphins and octopuses. It's more of a problem when the difference is small, or complex. Look at how much trouble we have with race.
The last time this came up was about 400,000 years ago, when the Neanderthals became extinct. Close to human level, but maybe not quite there. They lost.
Maybe that's the fate of humans. No big extinction. Just the demographic transition, a birth rate below replacement rate, for a few centuries. The machines outlive humans. Japan is officially resigned to this fate.[1]
[1] https://www.ipss.go.jp/pp-zenkoku/e/zenkoku_e2023/pp2023e_Su...