nope, you cant use a virus for depopulation purposes for many reasons. first reason is that viruses after being set free are mutating hence those who would unleash it couldnt develop an antidote for themselves. second reason is that airborne virus with a high mortality rate us prone to disappear very fast before doing a lot of damage. third reason is that airborne viruses disappear on their own all of a sudden and nobody can explain why it happens. so no, you cant use a virus to kill billions. you need to inject the genetic poison under guise of vaccination
Poland