Really? You’re going with a study the CDC is promoting based on two hair stylists?
These two case studies add to a body of existing knowledge:
“The finding adds to a growing body of evidence that cloth face coverings provide source control – that is, they help prevent the person wearing the mask from spreading COVID-19 to others.”
It’s worse than the way you describe it. The two hair stylist thingie is not a study,it’s a story. Studies have a control group where the variable is isolated. It is not “sciency” to put up anecdotes as evidence or proof of anything