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Here is a short tutorial how to make a paddle strop. I used the method described in Iwasaki's book. Pretty sure that is what Kanoyama does with their strops. ...

Pretty irresponsible description by the vendor. I had that model strop and it performed just the same as my #80000 Kanoyama. Identical surfaces as far as I can tell, just different thickness of the...

Do yo have a link where grits are mentioned? I have not seen such claims before.

The numbers are related to the thickness of the strop AFAIK.
The 60000 and up have an extra piece of leather too.
Leather has no abrasive properties it is used to burnish the edge.