It is not even mentioned there about serum from recovered people probably being effective in treating seriously ill people. My brother in California is vulnerable because of both age and respiratory problems, yet he has to work, doing repairs in peoples’ homes. He also believes that the disease is much more prevalent than present statistics. He accomplishes social distancing through cultivating BO, knowing that some people are too dense to observe social distancing.
Just because most people get it and recover with minimal or no symptoms is no reason to let down our guard, because of the problem of overwhelmed medical resources. However, antibody testing to let people return to work will be a great tool for many reasons.