Its hard to be sure about covert operations, but a speculation i have is that the pneumonic diseases in virginia nursing homes in June and July were test cases.

They had to make sure that it would affect the elderly in the nursing homes. When the operations were successful, they went ahead with the plan.

(As we now know, a large number of deaths in the US, are in nursing homes, thanks to the policy of Cuomo and the other Governors, in placing COVID positive cases back to nursing homes.)

Thats just my speculation.