Ah, I missed seeing that there were two devices in there.Why? They are talking about the iPod touch and the iPod nano. Two different iPods.
Checking the wikipedia entry, Apple described the iPod nano 7th Gen as their "thinnest iPod ever." It is 38% thinner (5.4 mm) than the Nano it replaces (8.78 mm). I suspect that the original iPod nano press release was a little off or at least not precise.

iPod Nano - Wikipedia
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