Again, read the article or excerpt. It means the vast majority of people that get it, have no or mild symptoms and aren’t being tested for it.
The South Korean data put the lie to your claims. You are passing around horsehockey utter unfounded dangerous horsehockey.
The town that had the first recorded infection in Italy tested its entire population and found that only 3% were infected. About half of them were asymptomatic. This Oxford study is BS.