I didn't get that out of the article you referred to. The article said that students mingling should be assumed inevitable:

"They're going to wander. They're going to visit each other. They're going to go into town. They're going to sneak off and have a party. This is what they do."

And that sick students should be grouped together, away from healthy students:

"Some colleges have the capability of a dorm or a couple of floors of a dorm where they could keep people who are infected,"

Sounds reasonable, better than sending them home, given the odds.