The study is fine, but the way it's using the word "asymptomatic" is not consistent with the conclusion you drew from it, and the 6% shows why. A case which is

The study is fine, but the way it's using the word "asymptomatic" is not consistent with the conclusion you drew from it, and the 6% shows why. A case which is "asymptomatic" in the study has no noticeable symptoms through the whole course of infection. If you know in advance that you're that kind of case, then you're less likely to spread the disease. But 94% of cases are not that kind of case, and no test except waiting a couple of weeks can distinguish asymptomatic from pre-symptomatic. Information that's not available until 14 days from now can't be used to determine who should wear a mask today. https://www.who.int/news-room/q-a-detail/coronavirus-disease-covid-19-how-is-it-transmitted https://www.who.int/news-room/q-a-detail/coronavirus-disease... "What is the difference between people who are asymptomatic or pre-symptomatic? Don’t they both mean someone without symptoms?" "Both terms refer to people who do not have symptoms. The difference is that ‘asymptomatic’ refers to people who are infected but never develop any symptoms, while ‘pre-symptomatic’ refers to infected people who have not yet developed symptoms but go on to develop symptoms later."