The answer is that illusory suffering is the result of causes and conditions that are also illusory. Even though pain is illusory, we still suffer from it, and we certainly do not want it. The same is true of happiness. It is an illusion, but it is still something we want. Thus, illusory antidotes are used to get rid of illusory sufferings, just like a magician uses one magical illusion to counteract another.
