Thats impossible, no virus affects 100% of population. Thats wy everybody talks about herd immunity which protects the rest of the population when you reach 60-70 % of infected. If you have 100% positive test rate it means you just dont test enough. But first og all the sample these doctors use is not representative for the hole population they talk about, thus there conclusions are wrong.
So if USA tested 1 mil. people and 1 mil. were infected, these to docs would say that hole of USA has covid19.