[chowells]

That sentence doesn't say what you think it says. It says "interventions to promote mask wearing". That's not mask wearing, it's telling people to wear masks. It is both true that wearing masks helps and that it's hard to tell if promoting mask-wearing changed enough behavior to matter. Mostly, those interventions do nothing.

[krona]

That's an ambiguous sentence. The main results of the study conclude:

Wearing masks in the community probably makes little or no difference to the outcome of influenza‐like illness (ILI)/COVID‐19 like illness compared to not wearing masks (risk ratio (RR) 0.95, 95% confidence interval (CI) 0.84 to 1.09; 9 trials, 276,917 participants; moderate‐certainty evidence.

Which I think is definitive.

[renaudg]

The original Plain Language Summary for this review stated that 'We are uncertain whether wearing masks or N95/P2 respirators helps to slow the spread of respiratory viruses based on the studies we assessed.' This wording was open to misinterpretation, for which we apologize.