Its a confusing article, confusingly written, merging campsite occupancy rates with campground property sales and new construction. I always view statistical info like this with a skeptical eye.
But just my seat of the pants observation with occupancy of sites in campgrounds we have visited in the last half of this year, they have been way less than full.
Right now here in Galveston all the 6 campgrounds on the island seem way less occupied than in past years wintering down here but we aren't fully into the Snowbird season yet. We drove through the KOA where we used to stay for the winter, at the west end of the island and it was nearly deserted, shocking really.
A rather large brand new campground that just opened this month right at the west edge of Seawall Blvd only had 4 RVs in it.
More confusing is that the most expensive RV park here in Galveston seems more occupied than any of the others but they do offer yearly leases starting at $7500. Most of the campgrounds here on the island range $750-825 / month or just a nightly rate of $60-80 / night. That might have something to do with low occupancy rates. We'll see what its like come January.