I wouldn't say Covid is a hoax, I believe the virus can exist. But, in this case it is difficult to believe it is the real reason for the death of those people, because they die more easily than "normal" people with covid. (normally less than 3 out of 1000 who have the virus die for it, in the case of these rebels, it appears to be closer to 9/10, which is very suspicious).
It seems to me that the covid is used for to make changes in the law so that rulers can have more power and people would lose their rights and freedom. And everyone who is against that, is a problem for the rulers and that would be the motive to kill them. And for that doctors could be useful tools.