Interestingly, your article is about false positives and includes the claim that the PCR tests are inaccurate.
This claim is, however, based upon a link that doesn’t address false positives but instead talks about false negatives. Even so, the false negatives are only in the brief period of about five days following disclosure. IOW, the linked article doesn’t support the article’s claim.
A positive PCR does not mean that a person is infected, sick, or infectious.
It might.
It might not.
A PCR is a rotten diagnostic test which is why it was meant for epidemiological use.