Here they speak about it on the FDA. The problem is that they if say 10 people are pooled and the test comes back positive. They are supposed to individually test everyone in that group to see who's positive. But they won't and this will be how they get their numbers. Nobody knows about pool testing so when their test says positive they assume it's because they were given an individual test and were positive. But of all 10 pooled only one actual person may of been infective yet all 10 tests show positive. So now the lab has 10 positives for the infection of one.If that makes any sense

https://www.fda.gov/news-events/press-announcements/coronavirus-covid-19-update-facilitating-diagnostic-test-availability-asymptomatic-testing-and

Here they speak about it on the FDA

https://www.fda.gov/news-events/press-announcements/coronavirus-covid-19-update-facilitating-diagnostic-test-availability-asymptomatic-testing-and