That is the narrative CP. Anyone that does not go out of their way to be subservient to China on any matter is said to be destructive to the needs of their own country. It is why we allow our capital to fly to China, export finished goods back home, destroy our local economies doing so, sell raw resources as cheap as possible to keep it going, absolutely no tariffs on anything China related, start the negotiations on China free trade deal (once again - communist governance) and even bend over to allow Chinas enterprises to set up shop here at home with even a smattering of allowing their workers to work as temporaryforeign workers in these shops here at home.
See, this is all necessary and good. The biggest economy and blah, blah, blah. Anyone who opposes that is bad because that person does not have their country's best interests in kind. Just ignore the reality of all that has transpired while being fully in compliance with China's desires.
Whatever China does with the Treasuries, it is the coordinated central banking scheme doing it. There is no independence. So that is how you understand who is doing what. There is no "China" is this situation. It is the central bank located in China but it is not representatives of China taking any such action. Every central bank demands complete independence from public influence so what does that say about "China" selling treasuries.
Even so, $1T pffft. The Federal Reserve just goes and credits $1T of 1s and 0s to the PBOC line and its a done deal. This stuff happens daily. Who bought the $3T of negatively yielding debt issued in the world the last few weeks? A bunch of retired people? Teachers unions? Pension funds? Caterpillar and Claas? No, the central banks did. They aren't audited and there is no oversight or control nor limits to what they can wish into existence. What is $1T of something created out of thin air and in infinite supply.