The marquee sign by the road says the park closes at 8.
The two scrolling signs on either side of the entrance plaza say the park closes at 8.
The calendar on VisitKingsIsland.com says the park closes at 8.
If you asked anyone in Admissions, they'd be able to tell you that the park closes at 8.
You could call the park and they'd tell you that the park closed at 8.
Seriously. Stop trying to find things to complain about. Most everyone else seems to understand it... and I doubt that ANY park employee told someone it closed at 10.