I think a reviewer posted a review under the wrong campground.
http://www.rvparkreviews.com/regions/Michigan/Holly.html
The latest review for the Holly Rec Area (1 out of 10) seems to refer to the KOA which is in the section above it. In fact the website for the Rec Area (which is a state park/rec area) now points to the KOA.
So I think that review needs to be moved to the Holly KOA section and the information for the Holly Rec Area corrected to back what it was.