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I think Aster is worried that every time you do something to the image in an image editing program, the program saves the result as a JPG(or whatever format it was opened as), therefore compounding the compression problems each time something is changed.
So I think he's not saying you'll gain any detail, but that you will lose less detail with each edit.
However, to the best of my knowledge, this is not the case.
Programs such as Photoshop have the image stored in a 'scratchpad' as raw data, it's the raw data that is edited, free of compression.
Only when you choose to save the edited file is the compression used.
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