The title is misleading in that it's not exactly the conclusion the article arrives at. The article has it quite the other way round: Once energy consumption doesn't grow anymore we either need more efficient means of growth (i.e. less energy consumption per growth unit) or we have to forego growth. It's pre-Industrial-Age Malthus all over again: Barring paradigm shifts that allow for more efficient production planet…
That's what absolutely everyone has been doing for the past 70 years. What happens usually when energy efficiency is called the rebound effect. We will create more with as much energy, not create as much with less energy.
Also, note that creating as much with less energy will limit GDP growth as well, as the GDP is based on creation of goods and services.