>>58799231We're not talking about regular cards holos here. that picture has nothing to do with polishing the holo. That's in regards with holo filler cards, which are excess cards in a sheet of holos that don't receive a the other layers due to them not needing to stamp the whole sheet.
Holo polishing is incredibly easy to spot under a microscope due to the "valleys" from pressing down on the holos with the swab, the circular microscopic scratches and the actual lack of medium scratched that are polished off. A card can't get microscopic scratches, big deep scratches and no medium sized ones.