You're not wrong, but those companies typically have Chinese competitors, so they tend to be wary about promoting people of Chinese descent to executive positions.
My apologies, I didn't know you were talking about non-founder CEOs. The truth is that the US has identified China as its primary competitor, so Chinese-Americans need to work harder to become CEOs. Chinese people should study hard so that they can use their knowledge to start profitable businesses. In my opinion, it's more meaningful to become a CEO of a company that you founded than to be promoted to that position.
Here is a promising start-up with Chinese-American founders:
People have tried to discredit them, but I know one of the co-founders and I'm confident that this company is legit. Chinese-Americans should follow in the footsteps of people like Steve Chen (co-founder, YouTube), Jerry Yang (co-founder, Yahoo), and Justin Kan (cofounder, Twitch). However, unlike those three, they shouldn't sell their companies.