In this case it would be "natural causes" or something else like that which can be written off as not due to any sort of neglect or misbehavior on the part of the prison operators.

COVID deaths have already been frequently written off in general as natural causes or "pneumonia" etc as of late because either the victim wasn't tested or there was a desire to minimize the # of reported cases.

Though I wouldn't be surprised to hear that happen, I doubt 73% of inmates are in a situation where that could cause their imminent death. It would take a ton of work for those kinds of events to happen while w medical team listing some other health issue as the cause of death