Update: the article was retracted.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7680614/
On one hand the article was bullshit. On the other hand, the journal isn't retracting its bullshit articles, it's retracting its controversial articles.
Quote:
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Originally Posted by retraction
1. A broader review of existing scientific evidence clearly shows that approved masks with correct certification, and worn in compliance with guidelines, are an effective prevention of COVID-19 transmission.
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If this broad review exists I would like to see it.