Nothing you wrote contradicts anything I said about camping. Someone else suggested that "campsite" just means the area covered by a tent and its groundcover, which is closer to the "mental image" of the other person who wrongly believes that tents got waterlogged, but is the arch opposite of yours. I've camped in the woods, on open steppes, and in designated camping areas in French and English towns. In each of those cases I brought my own tent, but I've also "glamped" and stayed in existing canvas-sided structures, from Yosemite to Mont St. Michel.

Also, this is about a campsite a few inches of which is in a lake, and people moving their tents. But apparently paying attention to the actual context is optional for some people.