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Notes -
I have not carefully reviewed the literature myself. I'm following what expert science communicators claim the literature says, as I expect them to be better identifying the flaws in studies and understanding what they actually say.
I agree that study result you linked is surprising. I guess it implies that either the masks are equivalent in quality in this setting or that masking had no measurable effect, most likely due to transmission at work being a rounding error compared to community transmission. Or something else is going on that I don't know to look for.
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