That kind of sounds like sensible corporate behavior to me. What is it exactly that you have against this decision?
Until there is more information, I can totally picture a scenario where Amazon uses the excuse that they can remove a troublesome employee from leading a walk-out by (falsely) suggesting they have been in contact and need to self-isolate (the pay is nothing for them). When the employee disputes that and come in they get to fire the individual under the pretext that he was not behaving appropriately and endangering other workers.