Evidence against the conspiracy is actually evidence for for the conspiracy. In this case, They charged him because he was right and they felt threatened by him.
Ah. So if I provide evidence that you are wrong, really I am providing evidence that you are right. Because I wouldn't bother presenting the evidence that you are wrong unless you really were right and I felt threatened by your rightness. Never mind the evidence itself.
He is joking, and it is funny, but it's not original of a joke. It's common for paranoid conspiracy theorists, to take any evidence of disproof and spin that as further proof.
Sadly, this is exactly what many will feel. I suppose in time their ignorance will be their undoing, as they'll be the ones dying off if any of these diseases re-surfaces.