They have had multiple false negatives the last couple of weeks at a time when no one on the team has actually tested positive. For now, I'll hope for the best. However, this is both a very Wisconsin thing to happen and a very 2020 thing to happen.
Also, the 21 day period is absurd. They can and absolutely should have to sit out two weeks, but the third week has no scientific basis. The stated reason is just to get them "back into game shape" which makes no sense for a virus where most college-age people end up symptom free.