They've drastically reduced holdings of US bonds, dollars and debt. The federal reserve is now the largest holder of US bonds.
Its not the most equal relationship in global affairs, seeing as how the federal reserve (probably) loans free cash to foreign banks to stimulate foreign economies. While foreign nations are unwilling to do the same for the united states.
Yuanization and dedolarization are just bluffs without any meaningful action. If China releases US bonds, under current conditions the US cannot possibly pay. If the US prints new debt to repay a debt to China, the value of US bonds will fall on the market and the yield will be higher. then the dollar value will fall. So that US companies have difficulty getting investment funds in the market. On the other hand, the RMB currency will strengthen further so that the cost of production in China is high and reduces the competitiveness of Chinese goods in America. The ending is the threat of layoffs in China.
In fact, China is bluffing but still holding US bonds by continuing to print RMB to buy dollars, with this trick, the RMB is devalued and the dollar strengthens which is certainly beneficial for China because the price of Chinese products is increasingly competitive and money continues to rotate in China. So it can be concluded, there is a symbiotic mutualism between China and the US, China helps America to print money by owing it to China.
https://www.thebalance.com/who-owns-the-u-s-national-debt-3306124
https://www.thebalance.com/u-s-debt-to-china-how-much-does-it-own-3306355