Excuse me: I bought something on Taobao. The owner is in Jiangsu, but the delivery is from Henan.

There are two possibilities. First, their own manufacturers have warehouses in Jiangsu and Henan, which can distribute goods. So the goods are sometimes sent in Jiangsu and sometimes in Henan. However, this situation is rare. Second, the owner is an agent. He may be in Jiangsu, but the goods he represents are in Henan. He doesn't have any goods on hand, just taking orders for others. Now many people on Taobao are agents of others.