This headline is inaccurate to the point of malfeasance. The study absolutely did not look into whether masks have a significant effect on COVID-19 transmission

This headline is inaccurate to the point of malfeasance. The study absolutely did not look into whether masks have a significant effect on COVID-19 transmission; it tracked whether a medical doctor's recommendation to a patient would reduce transmission. One of the limitations called out in the paper was the fact that compliance with mask wearing was low, and/or not tracked.