That's not true. There are good studies, followed up with full contact tracing in the environment it happened in, that show aerosol transmission in everyday situations (such as planes and restaurants)
Additionally on the poor fitting masks, triple layer surgicals are more effective (not effective enough) when double masking (which that situation is surgical first, cloth second.. this is the same as using a mask brace to ensure a tight fit)
However, the findings from Aaron Collins found that yes, they are better with a mask fitter.. but they still fail to qualify at the same level as an N95, KN95, or KF94 level of protection. (Those are the levels of protection you require when dealing with airborne based contaminants) On top of that it made it more difficult to wear.
The problem is not that they are ineffective but that people followed them poorly. I've seen countless people wearing them super ineffectively like leaving their nose completely out, and many people when they wear surgical masks they don't bend the metal bar to fit to their nose and instead basically have like a canopy instead of a mask which of course doesn't do much.