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
Please feel free to correct my assessment if necessary.