tl;dr: Treat this repo like a repo of .dotfiles: Fork, adapt, make it your own, use your fork
This is an opinionated recipe for how I personally do my TYPO3 deployments. It is meant for my my personal use rather than being a generic recipe for any TYPO3 deployment. It is therefore susceptible to change any time and there will never be a release.
In that sense publishing it on Packagist was a mistake and as of now the package is abandoned there now.
The only reason I made this repo public, is to give inspiration how it could work.
So my advice is: Fork it and use the fork the way you like it to