If I understand your post correctly this experiment was published in ETWOLD. He doesn't actually deny the possibility of time dialation exactly. If you look at the lucidity institute website you will find an article somewhere in there by Steven laberge saying he isn't 100% against time dialation. The sense is that time is kind of relative. Sometimes 20 minutes can seem more like an hour. Other times it can only feel like a few minutes. But dream time and real time are the same. Does this make sense?