I would actually take the statement a step further than that. It is not really even assumed detail or expected detail, I found when the sharpening was pushed beyond a very small amount it produced detail that really does not exist. It is more "predicted" detail than anything else.
I tried the AI sharpen on a scanned picture of a car I had many years ago and I have to say it failed horribly. It is an older car with a rubber seal fitting the windscreen rather than the bonded glass common since the early 80's, any amount of "Sharpening" at all and the paint on the A pillar was extended on to the black rubber of the windscreen seal, and other body styling lines suddenly appeared (I am pretty sure I know what a 240Z is supposed to look like, and it ain't that!)
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