Back to Illinois - the contact tracing aspect also baffles me. I thought that is why you do daily testing, or at least test multiple times a week.
Bottom line - it all depends on how testing goes the next few days for Illinois. If it gets to mid-week and they only have a handful of positive cases, I would expect the game to be played.
but, if it's Wednesday or Thursday and Illinois has 8-10 guys testing positive, then it would not surprise me to see the game called off.
update - this is from the daily paper in Champaign, Illinois:
Peters and Moore, per Big Ten protocol, will be sidelined for 21 days. That means they’ll miss the Illini’s next two games — home against Minnesota on Nov. 7 and at Rutgers on Nov. 14 — before becoming eligible to return ahead of the Nov. 21 game at Nebraska. The players held out for contact tracing purposes, which included backup quarterback Isaiah Williams, will quarantine for 10 days per Centers for Disease Control guidelines and will miss next week’s 2:30 p.m. home game against the Gophers.