Probably either a scammer or someone deluded by one.

There seems to be a small number of people who mentally come apart when they find out that their govt has lied about SOME things, like the mask mandates and the Covid jab. They then conclude that anything any mainstream source advocates is not only not true, but the exact opposite of truth. Mainstream opinion is that the earth is a globe, therefore it’s really flat. Mainstream opinion is that bacteria and viruses cause infectious disease, therefore they don’t cause disease and actually don’t exist. This mode of thinking is an inversion of the appeal to authority argument, but they are so intoxicated by their newfound secret knowledge that they neither notice nor care.

Then they get a superiority complex that they know secrets that others don’t know, and a persecution complex whenever someone tries to offer a counter argument. “You oppose me, therefore you are an establishment shill”, which is oddly similar to the Leftist thinking “you dare oppose me, therefore you are full-in-the-blank-ist”. These complexes combine to render the person completely immune to criticism, facts, or reason.

This is how you get flat earthers, naturopaths, and germ theory deniers.