Speaking of masks and science, here is the best science available right now;
Neurosurgeon Says Face Masks Pose Serious Risk to Healthy People
As for the scientific support for the use of face mask, a recent careful examination of the literature, in which 17 of the best studies were analyzed, concluded that, “None of the studies established a conclusive relationship between mask/respirator use and protection against influenza infection.” Keep in mind, no studies have been done to demonstrate that either a cloth mask or the N95 mask has any effect on transmission of the COVID-19 virus.
Any recommendations, therefore, have to be based on studies of influenza virus transmission. And, as you have seen, there is no conclusive evidence of their efficiency in controlling flu virus transmission.
Your link has an error and goes nowhere. I suspect it is the same one which keeps getting passed around the net, from a CHINESE researcher at a HONG KONG facility. Do you “really” believe that the ChiComs aren’t capable of facilitating a fake study???