Considering all the discussion of career switches and unhappy jobs, I'd have to differ with you on that point. To me it seems like the "doing what you love" is more in service to having a better job than the other way around. But I can see how you might come to the conclusion you have.
In fact, if you read the whole article, I'm somewhat confused that you could imagine he even primarily means economic betterment.
It seems clear to me that he means you should be working to live your life doing things you want to do. That's what the entire article is about.