I don't know about Dearstone specifically, but UT tested the gameday staffs for the men and women last week to start them in the SEC's protocol for "inside the court" and there were a bunch of positives. To the point that several full-time AD employees had to fill in for the official scorer and TV timeout person, when those jobs are normally done by outside folks.
The SEC sent out guidance to schools last week that radio crews will not be allowed to travel for conference games this season. The Big 12 has the same rule, so I would assume that Dearstone will be calling Sunday's game off a monitor at UT's studio.