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Not really sure what we're looking at there. Is it all bevel? with a hard/soft steel boundary or bevel and blade.

In any event, in the part that is blade or soft steel there are large...

Please, I fouind Mr. Parker's tone very much in line with yours to which I think he was responding. I found the content to be interesting, informative, and in my opinion, quite valid.
"This kind...

You're correct. It is a comparison of the grit size and the resulting depth of the scratch pattern. He is implying "how smooth of a surface/edge can you get with the compared stones". He uses...

Note that the picture with the ruler looks much different than the picture above it. Evidently the position of something varies from picture to picture.

Good observation Bart. The edge improved dramatically again by just by adding the ruler in the pic. ;)