> Just in your quote it stated that the control that cloth mask use was compared to was a population with a high proportion of mask wearing. The study does not compare cloth mask usage to no mask usage, and only says that it is possible that cloth masks are harmful.

That was me debunking the “before COVID, masks were known to work” claim of the GP. That was not a study of SARS-2 but rather Influenza.

The “masks don’t work for sars-2” was in reference to sars-2 aerosol transmission, which masks mechanistically don’t protect against. There is only one RCT of sars-2 in a community setting, and it failed to demonstrate an improvement in the primary endpoint of self-infection. There is no study showing that masks slow the spread of sars-2 in a community. Yet despite the lack of any studies, various medical authorities like the CDC are issuing statements that they do exactly that, which is a classic case of an institution using its credibility to advance baseless claims