Ok, only Americans have over-inflated self esteem, that's a different statement. Still wrong, but at least it's a common stereotype.

And I don't think that study supports your comment at all.

> Supporting this contention, our Chinese participants reported liking themselves every bit as much as our European American participants.

> This finding supports our claim that cultural differences in self-esteem arise from cultural differences in self-evaluations, with people from East Asian countries evaluating themselves less positively than people from Western countries.

> Thus, even though cognitive self-evaluations are lower in China than in America, they are not less predictive of global self-esteem. This finding suggests that global self-esteem is experienced similarly across dissimilar cultures

This study finds that self esteem is equally prevalent across the two cultures, and as far as I can see says nothing about how much the participants value their self esteem.