Saying that the person who authored the study was not a part of the school of medicine at Stanford is hardly disavowing the study. The guy never said he was. His CV is part of the study. You don't need to be a member of the school of medicine to look at and analyze data.
Now back to my original challenge.....show us a peer reviewed study using meta data that demonstrates that masks are effective. It should be easy for you mind numbed robots who believe anything the govt tells you. As for me, I deal with scientists in the govt every day and I can assure you that by and large they are not the brightest bulbs in the chandelier.