I guess it depends what you would define as rich. If you do not come up with some new hot thing and only count your pay. Then the article is quite right. People really rarely get rich from wage.
I know quite a few developers who are in fact multi-millionaires just from doing exactly that for 10+ years. If you're netting 150k and living on 50k, that's a million in ten years not even counting growth in the market.
Now, I'm not saying you'll be a millionaire, but definitely have somewhere in the ballpark of 100k in the bank after 2-3 years.