"Of these 127 [COVID-19 cases], 8 (6.3% [CI, 2.1% to 10.5%]) were asymptomatic. Of the 119 symptomatic cases, 20 (16.8%) were defined as mild, 87 (73.1%) as moderate, and 12 (10.1%) as severe or critical."

6.3% of transmissions being asymptomatic doesn't sound rare to me.

Also, the 89.9% of people with mild or moderate cases may still not realize they have covid, and spread it.

It's also worth noting that there is confusion between "asymptomatic" and "pre-symptomatic". In the health industry apparently "asymptomatic" means you never present symptoms, however you can be "pre-symptomatic"(meaning you will present symptoms) and spread the disease as well. The media had been using "asymptomatic" to mean both, but then a study came out saying it was rare and blah blah blah.

Should I be surprised how many people on HN have resorted to conspiracy theories, accusations of malice, and discreditation over changing and mixed information? We live in a world of changing requirements but somehow changing recommendations based on new and changing information is all the evidence we need to indulge ourselves in confirmation bias?