4//
They require the "previously infected but unvaccinated" group to have had their most recent positive test >=90 days prior.
>>> WHAT ABOUT THIS:- PREV. INFECTION cleared, but PCR picks up viral crap hanging round for ages after clearance?
Is that long enough to curtail the false positives from non-infectious viral crap hanging around?
i.e. Prev. infected means chance of a false positive are higher.

In conclusion: there are a large number of dubious methodological steps which could have been used to stilt the results.