It's not as simple as it seems, because as the article says, China has the ability to harm the US, but if it goes in that direction, it will harm itself as well. Simply put, China depends on the US and vice versa, and all this pressure from the US is just an attempt to reach agreements that will be more favorable to the US than they have been so far.
Why I might agree with your thoughts about this move having such a tendency of harming China in a way is how even the massive new tariff declaration by Trump affected US households negatively as they had to pay more on certain groceries and other items. We live in a world that's referred to as the global village maybe due to the economic interdependence that exists among nations, but critically looking the manner at which Trump went about with the tarrif it didn't implied that he understood how much they needed China as much as China needed the US for economic growth.
Cohn added that China depends on keeping the renminbi (RMB) weaker than the US dollar to keep its exports cheaper and more attractive for American buyers. To do this, China has kept buying US debt for years.
As for China's investment in Bitcoin, I think this is just one possible interpretation by one of the people from BlackRock who obviously want to emphasize the possibilities of investing in BTC even more, considering that they are doing great with their BTC ETF. However, whatever the economic situation on the global markets, I would not agree that China will just decide to invest in BTC, given that they are fanatics who are obsessed with control, and how will they control something that is decentralized and also largely depends on mining farms and various companies located in the US?
It's a matter of geo-economic rivalry with each wing strategizing amid the rising trade tension. If China finds a need to invest in BTC after evaluating all options it wouldn't be about trying to control bitcoin but as not to bow to Trump's pressure. In any case I don't think the US will hesitate if they find a spot through which they could control bitcoin as China. Unfortunately for both sides bitcoin is completely decentralised.