Even if we were to go into the thought process that this was a bio weapon, and to ignore the evidence suggesting the other side of things. Here's where we would get with that.
Who is this bio weapon for? China? China was ravagaed by this virus and many people were infected and died in China. Was it Iran? Same thing happened to them. Who would do this that isn't going to be effected by it in some way? I don't know, this is not something you'd, be able to control and just set it upon one person.
Unfortunately, by entertaining this possibility you're inviting more conspiratard theories to fly out of the woodwork: eugenics, population control ushered in by the new world order, the illuminati, Hillary Clinton, George Soros, aliens -- you name it, there's some people willing to believe it.
I refuse to believe in ideas for which there is no evidence. They are often not worth entertaining other than as an intellectual exercise. Sometimes I'd really like to believe in something: heaven, eternal life, the supernatural, but I just can't do it, because as of yet, we have no concrete evidence of any of those things. It usually makes for boring conversation, but during times of crisis, I feel like its not a good idea to let people get carried away propelling too much baseless misinformation.