Earlier quoted context omitted.
The premise of this bioweapon is that it can target the specific DNA of the target person or subpopulation. Anything which can do that can target the mutated genome of a cancer in a human. > of basically the same species type as the organism Which means you will not be able to target a single person or subpopulation, because they are all the same species type.
I don't disagree with what you're saying I'm just saying that the skunkworkers may not care about one method of treating their family members if other methods exist and work well.
We don't have even one method and we have many Nobel prizes to go until we get one, so I again state this is all science fantasy only fit for a movie or other fictional story.