It's not a huge amount, 1.7 billion USD worth in yuan, but door is open.
Basically US harvests values from other countries using financial cycles like this:
Lower interest rate -> USD flood the world -> economy booms -> raise interest rate -> USD goes back into the US -> economy slows -> countries can't get enough USD to pay debits -> get package from IMF, with conditions to "open up financial market" and allow US funds to buy up countries assets on the cheap -> Lower interest rate and it goes on.
Opening up yuan payment makes it much harder / impossible for US to play the boom/bust game and harvest other countries. Hence why the Guanqi team refer to it as "planting green painted rebar in chive field"