Why do you think it is not news?

Even the idea that the entire cohort was tested late into their infection, are asymptomatic yet are potentially still shedding is is very valuable information indeed.

It may well mean employers asking staff to isolate for a period who return to work without a test could end up transmitting the virus entirely unaware - as just one example.

The flip could be true, we may well have captured these people before they experience symptoms which lends evidence to an approach of mass testing across the board.

Of course take this information with context - but to suggest it's entirely useless information seems a bit short sighted.