Argument from authority is not particularly strong. The information on putty.org is considered misinformation by the vast majority of professionals in the field of infectious diseases.
This is the modern world that we live in. If being “Vice President and Worldwide Head of Research in allergic and respiratory diseases at Pfizer” with 25 years of career does not qualify to talk about vaccines (in the context of of Covid, I assume because I do not know him or the videos), I frankly don’t know what does
