FROM THE OP LINK....
Infection with COVID-19 despite wearing protective measures has been recorded, with even medical professionals equipped with maximal personal protective equipment (PPE) occasionally contracting the virus.
Despite this, face masks are still shown to be the most effective means of slowing the spread of the virus, and medical bodies worldwide recommend wearing them and maintaining social distancing measures.
Also, Facebook fact-checker reviewed this study and was able to highlight some flaws:
"The comparison made in the claim cannot evaluate mask effectiveness in reducing the spread of COVID-19, because the study that the claim is based on included many more people who wear masks than people who didn’t," the fact-checker. "Of the 314 individuals surveyed in the study, only 11 never wore masks. Because the group sizes are so uneven, a comparison of the proportion of people who tested positive for COVID-19 who wore masks and who didn’t would show mask wearers to be the majority
Facebook fact checker?
314 infected people surveyed.....70% of them wore masks.
Facebook “Factchecker”: They over sampled mask wearers.


their study trial group only had 11 people in it, that did not ever wear a mask...and 303 people in the study group that did.... a more informed study would be half of the study group as mask wears, and half the study group of maskless deniers.
from what I've heard, non mask wearers are TWO TIMES likely to catch the corona virus than mask wearers.
btw, your article says the mask wears, wore their masks in public, except when eating out... these studies show that most mask wearers that catch covid, ate out in a restaurant, where they took their mask off.