It does make sense, but...
I'm a collector that can tell when something is a "details" grade coin about 80% of the time. Cleaned, pitted, damaged, whizzed, etc. will cause a coin to get a "details" grade.
I'm not a buyer that resells, but I am a collector. Collectors ultimately want the best-looking coin they can afford. "Store owners" selling coins to collectors want coins that move quickly.
Key dates coins can have problems, but they will still sell. It is up to the person selling a coin to know what the fair market value is, so they don't feel cheated. But that also means realizing the business owner does need to make a profit. (That is why I use eBay's completed sales, in the "Advanced" search box, to guide me towards a fair price that I can live with.)
Well, I'm not entirely sure the pitting happened from the peroxide or if it was already on the coin from being in the ground, but hidden by the dirt/dust. All I know is that when the dirt came off, pitting was present. Pitting didn't happen all the time.
You could run a few experiments. Immerse a non-valuable new copper coin in peroxide and check it at regular intervals to see if pitting happens to the copper plating. Do the same thing with other denominations to see how it affects those metals.
These suggestions can be used as a guideline, but that is why it's best to confirm them yourself with non-valuable coins before trying on a valuable one.
Hope all this babbling on makes sense.
