Huh? I don't think he said that at all.From what Fingerts is saying I'm going from 700+/- to 400+'- shooting it.
Just shooting it won't deteriorate the condition from 100% to 90%. Just shooting it shouldn't affect condition at all, assuming you handle it carefully and clean it thoroughly. 100% condition does not imply that a gun is unfired or unturned; it simply means it's in perfect condition. And it can still be in perfect condition after being fired.
If you're going to shoot it and not take care of it so that it's condition deteriorates to 90% (which would require substantial abuse over a signifcant period of time), then you should not fire it.