they were referencing a report that came out of los angeles today that said after performing antibody tests it looks like a shit tonne of people have already had the virus and probably didnt know it. making it far less dangerous than has been propagated.
https://www.usnews.com/news/us/articles/2020-04-20/los-angeles-coronavirus-infections-40-times-greater-than-known-cases-antibody-tests-suggest