Remember people, there are two types of exchange rate regimes.
Floating and fixed.
The Chinese Communist Party still tries to fix the value of the RMB, but allows a daily narrow trading band.
If that is what the price of the RMB the government wants, that is the price the CCP will have.
Not anymore, the exchange rate is now in the hands of the US.
China can no longer afford to depreciate against the USD without losing purchasing power in everything else.
As show in 2020, the Fed is willing to absorb trillions of treasuries from any seller.