A most curious paper I might add...
Asymptomatic infections may be harmful for spread but could actually be beneficial if they lead to higher rates of exposure.
Our theory is based on the likelihood of masking reducing the viral inoculum to which the mask-wearer is exposed, leading to higher rates of mild or asymptomatic infection with COVID-19.
These studies have limitations, since experiments to examine the dose of virus to achieve its LD50 have necessarily not been conducted in humans.
It assumes much as part of their "theory" about masks reducing but not stopping covid infection and that this lessened exposure therefore would mean you get a smaller "viral load" and thereby develop an immune response without getting the disease, but of course, we don't know because we didn't test it on humans. And this **** is what we call "science" today and not even peer reviewed as best I can tell.