A megacity almost by definition includes suburbs. It is the urban conglomeration, not the official city limits. So Chongqing should definitely be included.
What are the classifications of a megacity? Where's UAE (Dubai) and Qatar (Doha) or Spain (Madrid) or even Canada (Hamilton, Ontario, Quebec, Toronto, Montreal, Vancouver). Also for the U.S where is Philly, Miami, Houston, Dallas.
Both New York and Los Angeles are being considered by the Metropolitian population, if we were to do that then why wouldn't Germany be on the list. On wikipedia its lists Rhine-Ruhr as over 10 million.
It's similar across Southeast Asia - big national populations, but mostly relatively small cities. With a quarter of a billion people, Indonesia should at least have a second. The difference in population between Bangkok and Thailand's next largest city is phenomenal. In general Southeast Asian populations seem to be more widely spread than in other parts of Asia.
Not sure what you're talking about. Bangkok, Manila, Hong Kong, Shenzhen, Guangzhou, Saigon, Jakarta, Surabaya, Bandung, Hanoi, Kuala Lumpur, Yangon... all huge. Indonesia is a big country.