Somewhat tangentially related, I would like to know how the parent poster or for that matter printed the document.

somewhat unrelated, I don't use emacs but is there a way to break lines such as

#+caption: [[https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux....]

in the org mode source? https://blog.lizzie.io/linux-containers-in-500-loc.org

Because many of us needed to thrust our work to thick books on the days before ubiquitous Internet. :)

It's kind of strange, considering that most of the non-fiction books I remember most fondly, are fairly thin. The big tomes tend to largely be forgettable (there are of course exceptions) - I guess often because they go into too much detail that date rather than concisely describing concepts.