Alternative and nuclear energy use is still energy use. It may not create the same pollution as coal or oil, but that doesn't affect the arguments from the article.
Growth of energy use is unsustainable, and that may mean economic growth is unsustainable.
Maybe some of the now-emerging countries skip the oil/gas/coal phase entirely and go directly to renewables, in the same way that Africa skipped the landline and the traditional banking in favour of mobile phones and apps.