This is an opinion piece, originally published in the Washington Examiner, and if you read to the end, the study it says the following:
"The high risk of bias in the trials, variation in outcome measurement, and relatively low adherence with the interventions during the studies hampers drawing firm conclusions. There were additional RCTs during the pandemic related to physical interventions but a relative paucity given the importance of the question of masking and its relative effectiveness and the concomitant measures of mask adherence which would be highly relevant to the measurement of effectiveness, especially in the elderly and in young children."
Their data was flawed and they cannot draw any conclusions of the efficacy of masks.
While your opinion piece says this metadata study is the "gold standard" of research, it is not. A double blind study is the gold standard. Metadata studies mine conclusions from data, but they don't control the data selection or the criteria for each data set.
Then there's the overall problems with using metadata in research. The data subsets may not have matching criteria, and the results may be reliable as a result.
Metadata that are structured using principled schemas and that use terms from ontologies are essential to making biomedical data findable and reusable for downstream analyses. The largest source of metadata that describes the experimental protocol, funding, and scientific leadership of clinical...
www.nature.com
You can't keep glooming onto every half baked study that proves your bias, when all of the validated and direct research says otherwise.
In the USA, just look at the rates of disease and death in counties where there was a mask mandate. It was half the number of sick and dying as the counties with no mask requirements. What is shocking to me is that this simple and effective precaution, that does you no harm, makes you people so crazy.
There are more important things in life to get upset about and having to wear a mask isn't one of them. American keep looking for pointless to go crazy about.