He was using the equivalent of a Facebook infographic to "prove" that epidemiologists are wrong.
His type believes that scientists are part of a cabal that is lying to the public for nefarious reasons.
I won't say that he himself is deranged, but his thought pattern on this issue is.
Anyhow, for those who believe in science: https://www.pnas.org/content/118/4/e2014564118