So, apparently middle class PRC citizens are spending hard currency to fly to central America and then sneak into the US. What is weird about that is most airline routes do not cross the Pacific directly from Asia to Latin America. It has to do with not spending majority of flight over ocean which means that transit routes usually go Asian city to middle city like Dubai or Paris or Frankfurt or perhaps over the great circle to Los Angeles via Siberia/Alaska/Canada.
So, the huddle masses yearning to breath free are more likely the educated and (possibly talented) who just don't like their odds of prospering in a system like that anymore.
This particular article identifies Ecuador as being a hub for this transit from China to Colombia to the US border.
https://www.cnn.com/2024/01/08/americas/china-us-migrants-illegal-crossings-intl-hnk-dst/index.html