Not sure how this affects things, but NU's 2020 fall semester ends Nov. 25 this season. Typically it ends in mid-December, and typically, mid-season transfers have been eligible on the day after fall semester ends.
I'm guessing with quite a few schools moving up the end of 1st semester, the NCAA may have to issue something regarding mid-semester guys. If they don't, with the delay in the start of the season, basketball is basically a one-semester sport in 2020-21 for a lot of schools.
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EDIT: Looks like the council recommended yesterday that no mid-year transfers are eligible for the fall sports that are moving to spring. It wasn't clear if that applies to basketball and other winter sports that span two semesters.