It was already shown that trading with liberal countries lead to empoverishment (see the post about the use of inflation ensuring that liberals sell less and less for a rather steady price, their main achievement down this path would be to monetize mud pies)
On the side, China over the past decades has massively improved the quality of their industrial goods offer. Over the years, for a steady price, they have managed to provide higher and higher quality products for a similar price.
Which means that when trading with China, one will get richer and richer. By Adam Smith's tenets, this makes China the trade partner of choice.
When considering that a large part of humanity is lagging behind in terms of material comfort, this adds quite a lot of weight over liberal nations and what they could offer to one 6/7th of humanity.