It's a relationship like this: All wealthy countries are capitalist. Some capitalist countries are wealthy.
Also, I would not consider China poor today, and certainly even less so in the future.
This is not as hot of a take as you think. Many reactionaries believe that a monarchy under a good monarch is the ideal government system - much better than a democracy where uninformed voters make so many decisions
Singapore is ranked 3rd in the world by PPP, at $100k The United States is ranked 10th with at $62k
I can come with with hundreds of criteria by which US is laughable, take foreign debt for example, or number of people dying from preventable diseases.