Jason sent me a copy of his e-book. He's a friend and we talked about it while it was being prepared. It's quite good with lots of specific examples and suggestions.
Settings for the Z9 should not be viewed as "set and forget". Most pros are making situations specific decisions and changing to alternate settings as needed. It's a bit of a mindset difference. For example, as Jason was testing he tried several approaches to AF modes, Fn buttons, and even AF Activation. His settings have a lot of overlap with Alex Rae of Nikon (who delivers the Z9 AF program), but they are not the same and there are some differences.
I think this is a case where buying both Jason's eBook and Steve's book will pay off just to see small differences in the way each approaches their subject matter.