No, it’s just the Keeper has some harm moves to do when someone gets hurt (both PC, NPC or monster). With this move the Keeper has to pick the harm move from that list as if it was 1 level lower. Let’s say I’ve just got 1-harm scratch from a zombie; the Keeper normally could pick an harm move for me from the 1-harm or more list. With this move he cannot, he has to pick a harm move from the 0-harm list.
Is it clear to you, now?