Just because someone is a “doctor” doesn’t mean they are a reputable, trustworthy source of information. For example, there are doctors who promote the idea that hydrogen peroxide can cure cancer, and that tens of thousands of dollars worth of antibiotics can cure “chronic Lyme disease”. It seems absurd with how hard it is to go to medical school and get a license, but people come out the other side with the same intent to defraud, manipulate, and con people out of their money.
But of course people who want to believe what they say will eat it right up and point to their credentials as proof of what they believe.