Unless I’m misreading it, per the article, the Utah facility is using a rapid test
MLB plans to "present to the union and all 30 clubs more than 80 pages of medical protocols that are expected to detail the league's plans for routine rapid-result COVID-19 testing of players and essential game-day employees." Those tests could be "administered daily if circumstances warrant." Testing would be "conducted by a centralized Utah-based lab used frequently by MLB, in part to avoid detracting from medical services that may be needed for the general public."