Tmall supermarket has warehouses everywhere? So the delivery is so fast?

Hello, Tmall supermarket delivery is based on the principle of just entering, from which warehouse delivery. By April 2020, Tmall * * * has 28 warehouses-located in Guangzhou, Jiangmen, Huiyang, Dongguan, Nanning, Jinjiang, Jinhua, Jiaxing, Nanjing, Hangzhou and Suzhou, Shanghai Songjiang, Hefei, Shanghai Jiading, Changsha, Nanchang, Wuhan, Chongqing, Chengdu, Xi 'an, Zhengzhou, Qingdao and Chengdu.