Two ways to look at it:
(1) D'Onofrio isn't exactly a wizard
(2) He realizes that no matter what he talks to them about, they're so basic it's all about focus.
I'm really reaching on #2. I whiteboard with 10-12 year olds. Even if we run something simple and have practiced it to perfection, they understand it better when I explain the flow. In the heat of the game, players' minds get lost. Simplifying tasks and illustrating breakdowns is a helpful process.
Don't like those comments.
I didn't want to speak out of school because I've spent exactly 0 minutes on a D1 sideline in-game, but every HS program I've ever been around worth it's salt has some sort of visual aid to draw up Xs and Os on the sideline - especially if, as Coach D has stated, the OC was "getting away from" things he'd done in the past. I dunno what to make of this, maybe it's not as big of a deal as it seems to me.