You've got it right. The only thingthat physically contacts the cd during playback is the spindle, which goes nowhere near the playing surface. There's nothing to scratch the surface.
However, depending on the design of the individual cd player in question, it is theoretically possible that rotational instability caused by the sudden deceleration could cause the disc to come into contact with any exposed hardware. It's not very likely, though.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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