Lu makes some interesting observations and a few good points. I think it's always good to get a different perspective. Sadly, Lu's explanation of the rotorhead's function is incorrect in several ways. Therefore, it is up to each individual to weigh opinions posted on any public forum and to discern the truth for yourself.
These debates have raged on for a L - O - N - G time, with Lu. I chose not to engage them anymore because it is a mind numbing exercise... with little reward. Now, Lu has given some real insights to a lot of other areas, so don't throw out the baby with the bath water!
Keep an open mind!