PCR tests are maximum about 80% true positive. That is pre-delta and at day 4-6 of infection; ramps up prior and down after. Worry about the false negative rate, not the other way. Really bewildering why test accuracy has not improved in 18 months. As already stated, false negative is the key issue.
Rapid antigen are less than 80% true pos, but actually do better on part of the shoulder period to PCR max, and are cheap and quick. Should be being used a lot more in Aus. Are being used in some situations, a bit below the radar, e.g. certain progressive logistics and food processing coys.
As above, false neg is the main concern.
Edit: that alt-guardian site (or whatever it is) is total QAnon crazy land, but article kind of latching on to a truth, in a weirdarse sort of way
PPS. that
https://off-guardian.org site accepted my first few couple of reasoned posts kind of, then they won't show any more. Wonder why the AI is out to get me? Cookies, IP addresses and conspiracies? Didn't like being challenged by an actual technologist/scientist? Maybe they are actually psuedo-news, tin-foil hatters, propagandists... you choose!!!