Indeed, the linked article doesn't say anything about lack of sanitation, and almost implies the opposite.

»Imbruce, who's researched the Chinatown produce economy for over a decade, is the author of From Farm to Canal Street: Chinatown’s Alternative Food Network in the Global Marketplace. In the Journal she distills to Kadet the real reason Chinatown can keep prices low: “Chinatown’s 80-plus produce markets are cheap because they are connected to a web of small farms and wholesalers that operate independently of the network supplying most mainstream supermarkets.” While most of the rest of New York's markets get their produce from the Hunts Point Market in the Bronx, Chinatown sellers work directly with small neighborhood warehouses. Since they're operating in close geographic proximity, they can get fresh produce throughout the day from wholesalers, and therefore don’t need a store with refrigeration or a lot of storage space.«