Well, in this case, they do have a valid point, in that the growth that China experienced was due to high amounts of capital investment rather than innovation per say. And as we know from the labor theory of value, high amounts of capital investment comes from a correspondingly high amount of the workforce being employed in producing the means of production (rather than consumption).
But to this point, there are 3 rebuttals
- Xi has made it a point to shift from factor based growth to innovation based growth
- An an underdeveloped country, China needs high growth in capital. The criticism about factor based growth only applies to fully developed countries. Lifting 800 million people out of poverty is proof that factor driven growth was the correct path for China to take
- China only became such a massive exporter of goods because the advanced capitalist countries de-industrialised. At the same time, these regions maintained high consumption due to imperialism. Chinese industry is forced to pick up the slack of America/Europe.
This is exactly the case. China has developed to the point where it can seriously consider a change in priorities. Of course, the overall course is still to race towards prosperous socialism but with changing material conditions* come changing tactics.
*the big one being Chinese labor becoming more expensive and Chinese industry becoming highly automated.