The Chinese government's policy is indeed an unexpected advertisement for decentralized exchanges. But I have a puzzle: how to exchange Fiat into cryptocurrency? The important role of centralized exchanges at present is to undertake the exchange of fiat and cryptocurrency.
They just wanted to confuse those who speculate that they cannot do this kind of thing because everyone is talking about if they cannot control the flow of the crypto market in their country, they just automatically banned everything about cryptocurrency. Right now if they tell you about their promotion about the decentralization of exchanges in their country, you need to be aware of their deception where they can change the tide at any moment.