It's more than just their active 30. It also means deactivating anyone who was in their clubhouse and/or dugout. Manager, coaches, trainers, clubhouse attendants. Everyone. Every. One. We are essentially at 29 teams and counting. Counting down, that is.
I'm hoping that MLB planned for this scenario. The answer: bring up the B team and get them on the field. It's really the only solution if MLB wants to have a season. They said they wanted to play ball, let's do it then.
If this were the Twins I'd say the same thing. Do what you can: Blaine Hardy's starting tomorrow. Austin Adams starts Wednesday. Nick Gordon's leading off followed by Zander Weil and Yasiel Puig's hitting cleanup if he passes the physical (pre-covid diagnosis example for Puig here).