I disagree with this. You are not trying to prove that you are awake when doing an RC during the dream. You are trying to prove that you are dreaming.

Doing RCs during the day is like rehearsing for a play. When you are rehearsing, you know that it is not real, but you pretend that it is so that you are better prepared for when the real deal happens.

When doing RCs during the day, pretend that the RC fails and that you realize that you are dreaming. After this, pretend doing what you plan to do after you realize you are dreaming so that you are prepared for that as well.