That is essentially a repackaging of helloSystem (https://hellosystem.github.io/docs), which itself is a FreeBSD spin with a custom display manager.

The "source code" in this repo consists entirely of Makefiles and build scripts for working with helloSystem, along with a few FreeBSD header includes that were copied verbatim.

I mean, more power and best of luck to the author here. But let's not exaggerate the act of forking another repo and tinkering with its build process. All of the items in the post here (e.g. macOS application and filesystem compatibility) are still twinkles in the author's eye at this point.