Yes, this is the key insight. The mere fact that the virons are smaller than holes in the mask means nothing. The virons aren't expelled from our mouths or no

Yes, this is the key insight. The mere fact that the virons are smaller than holes in the mask means nothing. The virons aren't expelled from our mouths or noses on their own, but are attached to moisture droplets which _are_ effectively trapped by surgical (and better) masks.