That article seems confused about who mask wearing is intended to protect. The first statement talks about people wearing masks spraying less fluid around, but then somewhat extraordinarily says that if you wear a mask you're less likely to receive a dose.
That may be true, but the second paragraph doesn't really follow from the first. It's true that if more people wear masks less people are likely to be affected as badly, but that's because if you've got it but don't know, wearing a mask is more likely to trap a lot of the dose from leaving your face.
It's why I wear a mask. I don't think I've got it, but I haven't been tested so I don't really know, so it's only polite of me to wear a mask when I'm out. I have to breathe through my mouth when wearing a mask and hillwalking, I can't get enough air through my nose when my breathing is elevated and I'm wearing a mask. And when I breathe in through my mask, it gets sucked to my face, so I'm sucking in air under pressure through a small circle of the mask, which will filter it to a degree. When I breathe out it mostly goes out the sides of the mask, with a little through the top depending on how well I've formed the metal strip against my face when I fitted it. The air taking a 90 degree turn means most fluds don't make the turn and soak into the fabric against my mouth, and a lot of the humidity in my air soaks into the fabric along the sides as it cools. I don't know whether the virus can be effectively dissolved in air the way humidity is, but I'd expect a lot of my dose if I've got one to be also trapped in the fabric.
