Yea there is a chance anyone can be wrong but he is one of the head professors at my university with a doctorate in biochem, nutrition, and he worked for the FDA for 8 years. I know for a fact that it is possible to excrete certain substances from fats in certain concentrations.
Its quite clear that both you and the "professor" had either missed or ignored the class discussions on how THC is processed in the human body. Otherwise, both of you would have known as fact that, once again, there is absolutely nothing that can remove THC from fat cells, except time and physical activity.