I'm somewhat skeptical here. A search for "Beda M. Stadler" returns very few results - one of which is a link to this article and another a verbatim copy on https://www.worldhealth.net/news/why-everyone-was-wrong/. There is a reference on https://www.weltwoche.ch/ausgaben/2020-24/inland/warum-alle-falsch-lagen-die-weltwoche-ausgabe-24-2020.html from June 6, 2020, but no prior mentions of Mr. Stadler and his research.
As was stated by a few others, I really want to believe his conclusions, but this appears - at least on the surface - to be pure fabrication. Perhaps it should be moved to the fiction section?