I think discriminating a bit as to the sources and specific nature of the claims being made are worthwhile here...
foreign reporting on the PLA during normal times are average to dubious at best, and the questionable reporting of information on the coronavirus over the last few months have been notable as well. Bringing the two topics together probably warrants even more careful scrutiny.
That's very likely that foreign sources are dubious. Although its not in the realm of impossibility that some PLA units might be under isolation, from what I heard its an isolation or quarantine but there is no confirmation that the the cree