I dont like to give credence to the false flag concept, it is so badly misaligned relative to my own thought processes. Particularly when talking about millions of deaths. However knowing that their is a large group of people that believe in eugenics, and population control. Have been successfully practicing methods of population control for decades. Additionally government lies about nearly everything.
It’s no great leap to consider that they would remove large segments of population through “other means” I think the problem that needs to be resolved for them is, can the survivors be easily controlled and bent to their concepts of civilization.