The linked article is making an assertion that cloth masks protect the wearer by reducing the viral dose, leading to many more asymptomatic cases. It is saying

The linked article is making an assertion that cloth masks protect the wearer by reducing the viral dose, leading to many more asymptomatic cases. It is saying that mask wearing alone is enough to reduce your risk from coronavirus. That is actually the headline from the article: "Cloth masks do protect the wearer – breathing in less coronavirus means you get less sick"