The PCR tests should not be used to see if a person has a disease, even the inventor of the PCR test says that. An anti-body test might work better, but because COVID-19 is new (so they claim) the anti-body test may not be that accurate either. We simply have no gold standard test for a new virus.
Here are a bunch more articles on problems with the PCR test. Click here.
I had never heard of theragrippers before, #13 in your link, but see a generous donation from The Gates Foundation to John Hopkins.