The comment about the distance between sites wasn't suggesting that there are different rules within the same campground. The comment was simply that when the campground has campsites that are packed like sardines, there is no way to eliminate all noise to the point that the neighbor won't hear it.
In all the places I've camped, quiet time has meant no radios, no musical instruments, no loud outbursts, no yelling, etc. It has never meant no conversation. From the photos I've seen of this campground, even a quiet conversation will carry from one campsite to another.
So then the question becomes whose rights take precedence: the people who want no noise at all? Or the people who want to sit outside at their campfire and have a conversation?