Here's an attempt at interpretting it graciously: if China's economy grows, more Chinese people may be lifted out of poverty. This is obviously beneficial to their lives directly, but could also result in political shifts as the rising middle class becomes more of a stakeholder in society. More developed countries can also afford to have more environmentally friendly laws. There are a bunch of potential benefits to China and the rest of the world that could result from continued growth. Sacrificing these benefits to bring attention to human rights might actually be harmful in the long run by a wide range of metrics, and whether it's desirable to do so might depend on which metrics you value more and how you typically respond to trolley problems.