All he showed is that masks help stop -bacteria- in droplets, but masks will not stop viruses.

Also, corona virus is not spread just through droplet form (and such droplets fall due to gravity, which is why the six foot distancing is recommended, because they usually fall to the ground before getting that far).... corona virus is also spread via AEROSOL form, and the virus is so small, that fabric foes NOTHING to stop air particles from getting through.