Because the lines that do something are nicely categorized with documentation included. Instead of running it all, you can take a look what’s possible and apply it individually.
> Instead of running it all, you can take a look what’s possible and apply it individually.
That's true of any script. The fact that this one is well commented doesn't make it not a script.
A cheat sheet is something you hang on a wall and glance at every so often. A script is something you run to make changes to a system. You can't run a cheat sheet.
How do you tell that it's not a really long string or a web page but a script? Maybe it's just a pattern of dots projected on LCD or 1s and 0s stored on a computer. I don't see any more concrete proof that it's not any of these but a script.
If you don't want to make changes like turning the highlighter color to green or set the TZ to Belgium, it's a great template for making your own version of the script, and it does the useful work of collecting a bunch of 'defaults write', 'pmset', and 'nvram' commands