Here’s a question in response: would China have seen such a huge reduction in povery if it didn’t offer cheap labour in the first place?
The main draw for foreign investment, capital inflow and trade, I would argue, was: (a) heavy investment in its stock of “hard” capital assets (i.e., great infrastructure); plus (b) an army of people willing to work for wages far lower than the countries making those investments (but generally higher than most of those people were making in agrarian sector).
This is arguably one of the most important (and complex) things for the world to understand well. There are billions more people around the world who haven’t been able to escape poverty whose futures really depend on getting these kinds of policies right.
I just don’t think that’s supported by the data though. On virtually every measure, living conditions have improved across the globe over the last century. You can pick out specific metrics where things are worse in specific countries (housing is the most obvious example where affordability has declined), but taken as a whole I just don’t see how you can draw any other conclusion.