I don't know who this Lou guy is, but are you sure he truly believed that a spinning rotor "was" a gyroscope, or that it just acted "like" a gyroscope?
ISTR he thought it was a gyroscope.
He was a very clever guy but sometimes simple things escaped him - I had a long argument about pitch change rods with him - he couldn't grasp that, much like a piston in an engine, they didn't have constant rate of vertical movement as they followed the swashplate and actually stopped moving vertically at the top and bottom of each stroke before they started moving again in the opposite direction.