These are new small businesses, not startups, specifically. They are the restaurants, catering services, print shops, laundromats, and interior design firms taking up the strip malls of the world. By the metrics used San Jose would rank as rather non-entrepreneurial, because there are many larger, fast growing startup companies, and fewer small businesses.
It's not a value judgment, but they're different things.
Chinatowns across the USA are exceptionally entrepreneurial, but mostly people own small shops. They are not making new things or business models, just running something that's already worked before as well as they can.