Nikon's major (and minor) recent firmware updates caught me both at a time when I was working on other projects and didn't have time to fully test new features, as well as having just made a full pass at updating two books, one of which (Z6III) is now impacted by the firmware changes. The Z8 firmware update literally dropped the morning I was on a small plane to the middle of nowhere, and I chose not to load it onto my camera for reasons I've outlined before (e.g. never take new, untried gear into situations where you need to count on it). Thus, I was already a month behind when I returned from Africa, compared to others who didn't encounter this situation.
I've now decided to take some extra time to try to conform all the Z9-generation books to the same current wording, templating, structure, and descriptions. It costs me money each time I send out emails and new links for updates, though I don't charge you for that. So instead of doing what would have turned out to be quick back-to-back updates, I've delayed my latest book updates to later this fall. At the point where I do make those updates, I'll also be updating a number of my other books simultaneously, so watch for an article that says I've done so.
The good news is that Nikon has been listening, and many of the things I and others have asked them to add or change are indeed getting added and changed (though not always in the manner we'd most like ;~). But Nikon has a full crew working on these changes, and I'm just a sole operator trying to keep up (while also trying to get ahead of them on other things).
So bear with me. Book updates are coming. Just not instantly.