Correct mapman, but anyone with some basic research skills can research that boron doped diamond is not superconducting till <10K. Anyone can research the conductivity of detonation diamond nano structures and see they are vastly less conductive than copper or similar metals. They see the charlatan claim a 5mpg to 8mpg increase for a truck (maybe it was 5.5mpg) and do some basic research on vehicle contact and fluid friction losses and know that is impossible. They can learn a bit about thermodynamics and contact and fluid friction losses and know that his massive horsepower claim for a dragster is impossible. They can see his claim that the owner of a company died due to claimed carcinogen in his product and know that this is not a good person. They see the claim that he would provide test results be reneged on and know he cannot be trusted. They can investigate surface roughness of connector and similar contacts and make some educated guesses about what it would take to fill those gaps to improve conductivity.
My statements hold up not because I have the qualifications to back them up, but because everything I said in the last paragraph is true and easily researched and verified. Some of it was easy for me because of my background so I see the numbers and know what they mean without further research, but nothing beyond someone determined to learn.