I'm unsure, but my best guess is that Carlsaganlvr10 was accepted into Louisville and checked the roster through the school's Blackboard, which is only open to admitted students for the Class of 2022. So for instance, if the class size is suppose to be 120, and the Blackboard shows a total of 100 registered members, then that would mean that the Louisville SofD still has roughly 20 open spots (spots in which the Admissions Committee is putting a lot of thought into, I presume !
).
Good luck to everyone on the waitlist, I'm also on it as well.