"One thing that puzzles me still (and seems also to puzzle you): VK is not stupid, nor is he a lazy man. Why then did he not do his homework?"

He may simply be operating outside of his area of expertise.  Engineers w/ PhDs are no less susceptible to cognitive dissonance than anyone else.  As Paul Simon put it so succinctly, "Still a man hears what he want's to hear and disregards the rest."

A good example of what happens when engineers, self-deluded and operating outside of their area of expertise, is the cold-fusion fiasco of the late 80s. Two highly knowledgeable electrochemists didn't know how to make calorimetric or nuclear measurements properly, and thought they were getting much more energy from their devices than they were. The rest is history.