closed the day Gobert tested positive, but early that morning. Italy, Spain, France, Switzerland, and or course China had all shut down before the NBA did, as had the UEFA Champions League and almost all soccer in Europe. The NCAA tournament had already announced it would be played without spectators. The dominoes had already started to fall.
Sure, the Gobert thing seemed big at the time, but everything that has happened since then would have happened anyway, although a couple of things might have happened a day or two later.