That's not what i've seen. They're looking at it for blood transfers and finding asymptomatic people have sufficient loads.
edit: i think this is logical (for my rudimentary knowledge) given the cause of death is not directly related to the virus. The symptoms of dry cough and fever are all the bodies response. Even the shortness of breath and pneumonia might be attributed to inflammation. Perhaps the asymptotic people just don't have such a strong response for whatever reason.
I've seen it mostly in the Dutch news until now. The source is the Dutch CDC (RIVM) via Marion Koopmans (Professor of virology and head of the virology department at the Erasmus Medical Center).
Article in Dutch (translated title: Mild corona virus symptoms seem to lead to lower creation of antibodies)
This article says that people with mild symptoms have fewer antibodies and says it’s unclear if they can be reinfected. Further it doesn’t mention asymptomatic cases.
edit: i think this is logical (for my rudimentary knowledge) given the cause of death is not directly related to the virus. The symptoms of dry cough and fever are all the bodies response. Even the shortness of breath and pneumonia might be attributed to inflammation. Perhaps the asymptotic people just don't have such a strong response for whatever reason.