I sent an e-mail to ask about it. Here's what the race director said:
The racewalk was only a registration category and was to let people know we welcomed racewalkers to our event (my mother is a nationally ranked racewalker). NOCRAP used to be involved and we are no longer allowed to present awards since it is a point to point course and we cannot afford to judge it. We've been told by participants and officials that awarding racewalkers when there is no mechanism to prevent run/walkers, is not fair and should stop. So, we stopped posting on the website that we'd be awarding any racewalk categories. However, we can provide a separate category for times and post that. I apologize for the confusion.
I appreciate his getting back to me so quickly.