The vast majority of China's trade surplus is recycled back into US treasury bonds (e.g. US Debt purchases). That's why China owns $1.3 Trillion in US debt, because it's the only nation that even has that sizeable trade surplus of US dollars to re-invest into US stocks and debt, other than Japan.
With US spending $3 Trillion plus on stimulus bailouts on COVID, do you realistically think EU, Japan, Mexico, Vietnam, Ireland, Italy, Korea, India, Thailand, ALL Combined can replace Chinese debt purchases? Nope.
So de-coupling is not possible. That's just rhetoric from news sensationalists baiting for clicks from bored people.
Not this year, with US Treasury Bonds being lowered, which means China not buying US Treasury Bonds, as bonds mature, and selling some of what they have. China's holdings are down to about $1 trillion, which puts Japan now ahead, though Japan is also slightly shrinking their holdings. China + Hong Kong combined however, amounts to nearly $1.5 trillion.
Instead, China puts its excess dollars buying large amounts of oil, ore and grain --- including oil and grain from the US --- in a move that appears like large scale stockpiling, in case of a war or their trade routes getting cut off. In fact, around spring this year, Chinese ports were overloaded with tankers full of oil, and the ships have to stay in huge fleets outside of the harbor, as ships are unloaded one by one.