I assumed this meant that the help defender doesn't get beat by the man he's rotating to. If the ball goes to the man he just left, now it's the job of the next defender to rotate to that open man and so on. If you left your man to stop the ball and still didn't stop the ball, I imagine that all the coaches would get upset about that.
I'm with you about "more effort" as an answer. Sure, it's part of any defensive improvement but it doesn't speak to a specific philosophy. Maybe he's being coy about it, maybe it hasn't been worked out yet.