Earlier quoted context omitted.
This is textbook ad hominem, and I think is against HN guidelines.
The comment above is a little mean, but I don't think it's ad hominem to note the author's lack of specific qualification in epidemiology or infectious disease. When I am a non-expert in a complicated subject, I want the advice of experts. When I go to my general practitioner, I want to know they have a certificate that says they went to medical school. When I need open-heart surgery, I want to know the doctor is a c…
If the purpose of such a note is to attack the validity of the author's position, this is what ad hominem means.