Your point of view is correct, and the ultimate goal of rebuttal is to refute the other side's point of view, that is, the argument. Obviously, it directly refuted his point of view. At this time, I directly refute his argument by denying his argument and his argument. The purpose is to refute his argument. So as long as the goal of rebuttal is clear, it is not difficult to grasp what is direct rebuttal and what is indirect rebuttal. Good luck.