I never play D&D like this, where the DM says everything the characters do and we just sort of roll the dice and choose our actions when it comes to battles. So I watch this just for laughs, never thinking I would get an idea out of it.
That said, I think they way he went about "grounding" one player for a single session was well executed, game wise. I am not sure that i would kick a player out for a session for being an a**, but then again it hasn't happened yet so who knows. If I was to do so however, I think that was a cleaver way, "spend a session at the elvish council being cleansed and getting forgiveness".
I might just have to use something like that one day.