I think it's not just Chinese, but pretty much most immigrant have a stronger desire to go back home.
Speaking as an immigrant myself,i don't think most of us came to the US because we loved american culture, we came for the opportunity, and as more and more opportuinity open up in culture closer to our native cultures, going back make more and more sense.
The other aspect i didn't see mentioned is that dating for an average immigrant man (which are still the majority of the immigration in tech) is a brutal experience; between the skew gender ratio, the ruthlessness of modern/app based dating and increasing intolerance against "conservative values" etc... for anecdotal sample, a large population are just leaving to escape the loneliness and try to start a family