Well the easiest part of your response is the question of the Africans.Covid 19 infects by attaching to human ACE receptor.We use ACE inhibitors to treat high blood pressure.It is well known that Africans don't respond to ACE inhibitors.So it is quite likely a genetic reason for their low rates of infection.
Secondly you quote 1 virologist who is an NBC Science reporter,Also don't mention where he works-the lefties will go beserk.
Fair is a senior fellow at The Scowcroft Institute at the George Bush School of International Affairs, Texas A&M University.
My source is a research unit who spent over 40 years researching cold viruses.
salisburyhealthcarehistory.uk
Plus there are many more such research projects such as the Pittsburgh cold study.
Sorry mate I have a full house and you have only Ace high.