Yangzhou does produce converse shoes, but it is an exporter. The shoes you bought are not fake, but they are not entirely genuine. Strictly speaking, it is foreign trade goods, which are released by the manufacturer. Generally, they are goods with redundant orders or slight defects.
Collectively referred to as foreign trade commodities, these commodities actually have no formal sales right in China, but it is normal to buy and sell foreign trade commodities in China. If the things you buy are flawless and cheap, you can wear them.