It's not fact at all. Its narrative.
The more desperate you get and the more you try to block everything out as "misinformation" without disputing it the more obvious it becomes.
At this point — it is fact. There are numerous large-scale reputable studies and datasets which clearly demonstrate that masks stop the spread of Covid and mask mandates work. It is laughable that anyone except the most extreme non-scientific Covid-denier would attempt this refute this at this point.