No modern id in the book. The book ends in 2002, with Romero and Tom Hall happily working on mobile games, with Romero having really short hair. And Carmack mostly working on his new hobby in Rocketry.
You’re right, it is pretty interesting that id software is still a tech powerhouse even after Carmack. I hope they continue to do well and we get another memoir of their post-2002 years. I’m sure there’s plenty of interesting stories about the Call-of-Duty-like Doom 4 they were working on that was cancelled, as well as how Carmack got more and more interested in VR tech. And then how the new design and tech crew clearly took over at id that worked on the Doom Reboot.