Your comment covers everything I have to say about this study. That it’s a bad conclusion/discussion and they should feel bad. Especially relating it to that stupid jogger study that has to argue with everybody in real life over for three weeks but I would like to add that those authors had not-insignificant ties to Russia.
Shortly after the Beirut explosion someone on Twitter marveled that all the COVID experts in his feed were also demolitions experts. I'm certainly guilty. We all are. In lieu of actual expertise we all through our best take up on Medium or whatever and before long we've got motivational speakers solving coronavirus. I made a living using fluid mechanics models for about eight years. That gives me the confidence to state that a Ph.D molecule counter better know hella more about counting particles with lasers than I do, but doesn't necessarily have a firm grasp on how to apply that count to a real-world situation. I want to believe they did their experiment in a dark shoe box in order to get a "more study needed" grant to do it in a room so that you'd actually get semi-useful real-world data. But I'm concerned that they figured a shoebox and a hair salon were equivalent because they're too overconfident to ask someone who knows. I mean, there were people to ask.