China is looking to get rid of the US dollar
Having all your eggs in the same basket is bad. China is diversifying. Not just now, they are doing this for more than a decade. They mainly buy God and other currencies. Eventually will switch also to Bitcoin, but that will probably be closer to end of this decade.
China has been opposed to bitcoin. They are open to cryptocurrency though because they have their own crypto ranking. It is suggestive that they are hoping to create a cryptocurrency that will match up with Bitcoin.