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.
I do feel that these are only statements and China may not act upon it, especially in the immediate short term. These are the ways and tactics to speak aggressively and give a strong message to your enemy that you can go any level, if the tension are not ended by the US. However, for the risky markets such as crypto and stock, such statements are enough to create the fear and bring the market down, but these downward moves are temporary as the people do realize later that the countries aren't capable of taking such childish steps.