The scratches in his pictures should be smaller than 1/10 grit particle size?
Edit: that was a serious question. Scratch size/depth seems to be one of the things you disagree with that blog about, so I'd like to know your opinion. Just innocent curiosity.
I get that you question his ability/expertise. I don't know the guy so I haven't formed any opinion on that. I'm genuinely interested in any problems/contradictions/inaccuracies you may have noticed if you'd care to explain why a given thought path or conclusion is incorrect. The ultimate goal in my opinion is being able to learn something from any given situation so I'm all ears. After you've finished cleaning all that yellow chalk off your garage floor, of course.
