Setting aside that I find it rather dubious that more hours worked is being equated to more profit/gdp/productivity, if/when the chinese economy becomes a net global importer, then I'd be more interested in this line of reasoning.
I became interested when this happened: https://i.pinimg.com/originals/f8/18/f8/f818f8735acfdbf8f4a6...
[0] http://www.imf.org/external/pubs/ft/weo/2017/01/weodata/weor...