Entirely curious: has he posted that he is American before? Where are you getting that from, are are you generalizing about all Americans and not talking about the poster above?
Yes, I'm American. I'm also generalizing and simplifying because an in-depth analysis of the China scam is the proper subject of a Ph.D. thesis and not a HN comment. As lionspaw has noted, there are complicating factors like the property boom (/bubble) and the grey market for inflation-resistant currencies. These hamper the current capital controls but do not render them entirely useless.