When I look into the website source of the book I just see static HTML and CSS as well as a few media queries. Why would you want to use htmx to serve a completely static website?
Ofcourse there might be valid reasons to choose to deploy statically using adoc (reusing for pdf, minimal maintenance etc.) but my point is about maximizing the impact.
The examples at htmx.org itself are like this (e.g. https://htmx.org/examples/click-to-edit/)