You got 3:34 out of me. He doesn’t say ‘they’re not scientific’. That was your claim. That’s not true.
I’ll break it down for you. He says if you have one molecule of something in your body, it can be magnified so much by the PCR that the results are mis-inferred. That is not scientific random sampling.
Scientific random sampling is saying we have 100 soccer players in a 2,000 student high school, so if we sample the student body in sample sizes of >30, we find we probably have enough students to produce a soccer team. By contrast, an overmagnified PCR sample would say we have 1 soccer player in a 2,000 student high school and
this school has soccer in it!!! - people who infer the wrong results from the PCR would claim the school has enough students to produce a soccer team, when in fact the school doesn’t. Therefore, arriving at a wrong and unscientific answer.
All of the PCR tests being used today have magnification levels above what the Nobel prize winning dude would recommend.