Interesting, but I am not so sure that is valid.

It is generally a person's own immune system that causes severe symptoms because of the cytokine storm a strong immune response generates. So not having immune memory of the virus or similar enough viruses, like from other coronaviruses, combined with an overactive immune system was behind a lot of the severe illness. That's why steroids were given to people with severe illness, to tamp down their immune response.

Given the history of spread with the virus, it would seem that high viral loads in asymptomatic people could be achieved while generating little immune response in immune systems that couldn't recognize the virus? Its not like the virus itself is what killed most people.

Regardless, we will still be learning more about this virus for quite some time.