I do believe it is more (business) immigration and the establishment (or takeover) of a retail industry than anything else. Not much in the way of retail shops (general stores) in Belize which appear to have been an opening. Restaurants and bakeries are way down the scale. If there has been a Chinse community in Belize in the past, I am not sure I encountered it. Learning from casual conversation, it would appear these folk are there to get Belizean citizenship before trying to apply for U.S. residency.