Despite being touted as evidence that masks do not work, even the study's authors have stated this is the wrong interpretation, and the lead researcher of this danish study has openly supported mask wearing. The study's findings indicate that masks are not effective at stopping people catching the virus, and do not deal with spreading the virus, something that has been extensively misreported; misused politically by some and caused confusion for others. But even then there are some clear issues with the study; it was carried out in Denmark a society that doesn't normally wear masks, so should demonstrate highly different from results in societies like Japan were mask wearing has become a normality.
Furthermore this wasn't a clinical study and had a highly compromise-able methodology, participants were free to report back the results, meaning the study could be susceptible to subject error. In addition the study doesn't take into consideration other methods of viral control, such as ventilation, hand washing, or face touching at all, other major protective factors that curb the spread of the virus. Finally the study did not look into different types of masks, equating all mask wearing to be equal and generating some misleading headlines. Given that most people just read headlines, studies like this could have had a hugely damaging effect to public health internationally.