They mean "once you've opened a package app (in this case designed for games) and chosen your game then it's a one click install per game". Not quite revolutionary though it's nice to see reports someone trying to innovate in the app install space for linux.
TBH I'd have thought having apt-url installed and going to a site like http://playdeb.net would be equivalent.
The reviewd djl and gamestore do a priori look good "niche" package managers though.
