This morning, as always, my son was up and dressed before the rest of the household; he likes time to play Minecraft before school starts. But he also cleaned the dirty glass on the woodstove, started the fire and brought wood into the house. Because he wants to.
The whole point is that they let him "slack off" sometimes because they've chosen to let him feel empowered to make his own decisions about how he spends his time generally. And they've seen that it pays off -- sometimes he plays minecraft, but most of the time he's on the ball, helping with chores and such. And (they say) he's doing it because he wants to, not because he's told to.
Here's a novel idea - don't let your kid play minecraft until he starts doing better in school.
Again, you're missing the main point of the article -- it's not that kid is failing school (and needs to be disciplined back into shape); it's that the school is failing the kid.