People typically get banned on Xbox for cheating on multiplayer games, like using aimbots etc.
The question was about access to single player games if you got banned on multiplayer games
He said, of course you will have access. The parent post said you'd be banned from playing your single player games if you got banned on Xbox Live. So yes, the benefit is access to single player games when you're banned from multiplayer games for cheating or being an abusive troll using bad language etc. in voice chat. Hope that makes it clear.
I didn't need help, you did