The article may say that - but it is conjecture which is not part of the study it refers to. There is no way research was done on the amount of social distancing and mask wearing done by the population in each region. And doing that wasn't something that was measured. That's guessing, and has no place in scientific study.
- and not touching their face -
and there in lies [ IMHO ] the biggest problem with Masks ..... PEOPLE TOUCH THEIR FACE MORE Adjusting The Damn Thing
EVERY Time you touch your mask you are supposed to SANITIZE Your Hands .... And People Are NOT
meaning there are contaminating EVERYTHING they touch afterwards [ if they are infected ]