Why doesnt this detect KOs?

So i put this together

delay(.5,function()
			if targethumanoid and targettorso and tool.Parent.Humanoid and targethumanoid.Health > 0 then
				for i, old in pairs(targethumanoid:GetChildren()) do
					if old and old.Name == "creator" then
						old:destroy()
					end
				end
				local tag = Instance.new("ObjectValue")
				tag.Value = tool.Parent
				tag.Name = "creator"
				debris:AddItem(tag, 3)
				tag.Parent = targethumanoid
				targethumanoid:TakeDamage(20)
				end
			end)

But i dont know how to listen for it. Doesnt roblox take care of it? Or do i need to do something else?

KOs and WOs aren't a thing anymore, they don't show up on profiles.

People who had badges relating to KOs and WOs keep them. Those badges are now unearnable.