I think he meant it. His English is very fluent throughout the article.
For my English, for example, native speakers tend to say that it is actually quite correct, but I have a tendency to use words in a specific way in which few native speaker would use them.
I see your point though. I think he does use words in ways that native speakers do not use, but in his anecdotes -- I think he's actually playing up his Chineseness for the comic effect, and he's very much aware of what's happening.