Billboard’s description is misleading, they are not selling vinyl recordings from the Bill Graham archives.
They bought his recordings library (audio and video) as well as photos/negatives/posters.
They have broadened their marketplace to include album sales (including handling used record sales).
The CDs I see also are used common market CDs (as manufactured by original companies).
They have an audio streaming subscription offer and host full concerts (for free at least at this time) on youtube.
It appears they do sell digital downloads of live concerts.
They are copyright infringers.
Bill Graham thought he owned and could control anything having to do with music in San Francisco.
Seems these guys do too.