China does not have a "massive" excess of males, just around 3-4% overall. The worst hit generations showed 15% more males than global averages, but this seems to be largely an administrative effect where girls were simply reported with a delay.

That being said, China does face a bride price crisis (caili), that has reached tens of thousands of dollars, an exorbitant sum for the the rural areas where it is common. This has led to unrest and public pressure on the government to intervene and regulate this market.

Extremely effective social controls designed to suppress an insurrection for all the other reasons Chinese would have wanted to revolt over the years.

It all makes sense when viewed through the economic lens.

Sexual freedom is a lot like capitalism. It leads to wealth concentration. Very few men attract the majority of women. This implies a class of sexually poor men. I suppose so called incels rising up and trying to seize the means of reproduction is a predictable outcome.

Many religions impose a sort of sexual communism: they try to stabilize society by imposing monogamous relationships, thereby ensuring availability of women for every man and preventing the accumulation of sexual capital. This explicitly counteracts the hypergamous dynamic mentioned in TFA where women would prefer to share a rich man than be in a monogamous relationship with a poor one.