Like many other rating systems TP has a problem. When they rate the park at a 10 and then it's worse later, they can only use 10 again, since the scale can't go to 11 or 12.
The Sunday race starts in the parks and then leaves the parks. It may cancel Extra Magic Hours for the resort guest but not likely. It may mean DL opens at 9am but again not likely. The race starts at 5am so everyone should be through the parks and out in time for the parks to open as planned.