I'm not sure where you're getting your numbers from, there are 94 code samples, I've just checked. Are you getting confused with "example applications", as in what's in the zip file?
Here we are also talking about A4 pages, in an epub format it's 180 pages on a standard font size, but we digress. More is not more, less is more when it's useful and you can learn something and apply it.
I've reviewed several of the books you've mentioned, and have them on my desk. They are huge and unwieldy, with much of their content available in the Go docs or standard library.
This book is use-case driven, and some of those examples are for different skill levels. Certainly, editing is likely to be more thorough with a large publisher, but the feedback loop and the ability to iterate are an advantage here.
An example: the part of unit-testing in Go (originally a blog post) was referenced in the Kubernetes documentation as an example of how to learn to unit test.
Serverless For Everyone Else has sold ~ 450+ copies with a similar structure and very high ratings. It's not about page count.