No problem, I get that this is confusing.
So just to sum it all up.
Somebody, https://github.com/TheHumanRobot in this case, made a cool software. He also made it into a Docker container.
Somebody else, me in this case, made this cool software appear in the Unraid "App Store". For this I wrote a template and gave it to the "App Store".
Sometimes this is the same person, sometimes there are even more people contributing to this whole process.