I think he might just be a guy who stuck a diesel into a motorcycle and got an interview. I'm not sure if he understands everything he is talking about. Though if you look up the conversion plenty of other people have done it with similar results-
10 Hp Diesel Engine Electric/Recoil Start
for anyone interested in the idea this engine here might be an amazingly cheap route to convert a small enduro or any small bike to run on diesel.