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That is simply not true. Manpower in China used to be cheap, but that was one or two decades ago. The wages have risen to such a level that they are now 2-3 times higher than the comparable salaries in countries such as India and Indonesia. On top of that, they are now getting strict with environmental and other regulations. Lax regulations attracted a lot of investment earlier.
That could be the case but you know that anything that China projects towards other countries are not entirely true, yes the wages increase but the working hours are longer. They might not damage the environment that much but they have factories in Inner Mongolia too, they tried to create an apartment complexes that has plants that help absorb particulates in the air but it backfired because the complexes are now a hellscape infested with mosquitos which is a waste of materials. Those regulations are not in favor of foreign investors as far as I know but I do commend how their government does not have a schism.