The title is inaccurate, they acknowledge on the first paragraph that it captures large droplets. that's reason enough to wear the mask
Also, most governments advice people with a cold/fever/… to stay home. If they do, and given the current estimate of infection rate, those droplets aren’t likely to contain the virus.
Data does not back that if you (anorphirith) shoot me (wegs) in the head with an AK47, I'll die. That particular study has never been done). But we know it's true. But a carefully-phrased headline gets picked up by the popular press and builds university branding.
See also "significant" (which means "statistically significant," so might be a 0.000001% effect size with enough data, but which the public picks up to mean "big"). These are well-developed techniques for roping science-ignorant reporters.