No, Jiangxi Xiaochao Has Not Swept Jiangzhehu
I do not know who first coined the phrase “Jiangxi xiaochao has swept Jiangsu, Zhejiang, and Shanghai.” People repeat it often enough that it sounds true. It is not. Jiangxi xiaochao has not swept Jiangnan, and it has not swept Jiangzhehu, the shorthand for Jiangsu, Zhejiang, and Shanghai. The phrase reads like the work of someone who spent time in Hangzhou, Wenzhou, or Jinhua and mistook a dense local migrant-food scene for a regional trend.