Well, the veracity of an an "opinion" comes from the background of the opinion-holder's experience in the subject-matter... If you have a heart problem, do you ask a teenage kid or a cardiologist?
David Reher has, for many years, made his living, building and dyno-testing racing engines, and has that experience from which to form his opinions.
His opinion is based on years and years of solid experience... That's important to me.
I think he's in a better position to have access to more accurate information on the subject than a person who ( like me,) just does this as a hobby... that's all.