This place must have low COVID numbers because EVERYONE is wearing a mask. (And some are quite stylish.)
Wrong.
This is in a "hotspot" in Brazil, the country with the highest number of new cases and deaths in the world. (How's that for anecdotal evidence?)
Even though the image you show of Brazilians all wearing masks from the perspective of a telephoto lens, it does not show people using the 6 foot rule. That kind of crowding would be all it takes. However Brazil was lax in the needed mitigation efforts in the plague’s early phase of growth. A skeptical president with millions refusing to socially isolate themselves, caused the virus to take off.