As far as I know this is what happened:
The creator of alphaOS (simargl) had the
http://alphaos.tuxfamily.org website, this forum, and a repository on github.
After a few years of doing an excellent job simargl stopped the project, and this is when scooby (the smartest of us all) took over the project.
Scooby got access to the alphaOS website, this forum, but somehow the transition of the github repository didn't happen.
So simargl released the AlphaOS repository and everyone was free to pick the same name.
Apparently somebody did, and
https://github.com/AlphaOS got restarted by user
https://github.com/g97iulio1609.
AFAIK that user is not affiliated with simargl's/scooby's AlphaOS and uses some Antergos files and not files from this project.
Bottom line is that
https://github.com/AlphaOS does not contain the files of this (
http://alphaos.tuxfamily.org) project.
Scooby,
Please feel free to correct my assessment if necessary.