Germ theory denialist? You can buy agar (for what? 20 bucks?), leave it out at room temperature, see what grows, put your tongue on it, and see if you get sick.

Dr Mark Hyman, who has been called a “germ theory denialist” by the medical author Harriet Hall, and has been brought on as a contributor in Weiss’s revamping of CBS’s news division. He is perhaps the most prominent exponent of so-called “functional medicine” (FM), an alternative medicine that the oncological surgeon David Gorski has described as “pure quackery”.

and

The Institute for Functional Medicine, which counts Hyman as a board member, claims on its website that FM “restores healthy function by treating the root causes of disease”, and “allows clinicians to systematically identify and address the underlying processes and dysfunctions that are causing imbalance and disease in each individual”.

In practice, according to advocates, this involves seeking underlying causes of illness by testing stools, hormones and food sensitivity, and treating them with supplements, nutrition and therapies including yoga and acupuncture.

Illness is often attributed to underlying syndromes like “leaky gut” – which Hyman discusses on his website and in social media – which scientists say “cannot be accurately diagnosed by symptoms, blood work, or stool studies”, and is “not a real diagnosis”.

Scientific critics, however, say that FM is little more than a rebrand of alternative medicine, with the late oncologist Wallace Sampson characterizing it as a collection of “abandoned concepts” undergoing “resurrection under a more modern slogan, ‘Functional Medicine’”.

So that's not a self-proclaimed title. He's just a grifter who's going to be bashing the FDA, CDC, WHO, and the like. That's going to cause a lot of harm and people are going to die, whether it's quacks who refuse life-saving treatment or they decide to withold treatment because they can't afford a DEXA scan or something