After he was demoted at DeepMind for poor performance as a manager, that is. Suleyman is no technologist. He's a marketing promoter. He attended one year of college before dropping out to help sell DeepMind.
You have to wonder what's going on in Gates' head these days to not recognize the lack of substance in such a book, and in its author.
Far better books on the possible futures of modern AI are Stuart Russell's "Human Compatible" or Brian Christian's "The Alignment Problem", both of which predate the boom in LLMs but still anticipate their Achilles heel -- the inability to control what they learn or how they will use it.
If people don't know him, he is the classic impostor who just goes by contributing nothing to the field, but investing big in pr and bots.