As an accompaniment to the linked article, I'll also leave this one, presenting some counter-arguments:
https://theconversation.com/yes-masks-reduce-the-risk-of-spreading-covid-despite-a-review-saying-they-dont-198992?utm_source=twitter&utm_medium=bylinetwitterbutton
The scientific review examined 78 studies - but these weren't all testing the same things to begin with - and in many of them, compliance with the masking advice was poor (most of the people being tested didn't bother wearing the masks all the time). Furthermore, most of these studies only addressed the question of whether wearing a mask protects you from other people: they did not address the separate, but equally important, question of whether it protects other people from you.
So, I certainly wouldn't take this review as "definitive proof that all masks are completely worthless". (Indeed, if I read the article linked in the OP, it seems that the authors themselves were aware of the limitations of their own review... but of course, they can't control how the media reports and spins it!)