In developed world energy intensity of GDP is decreasing even when you take into account imports. Post-industrial economies can grow while decreasing energy use.
What the author is suggesting is that the developing world should stop growing. I can't agree with that. They need their electricity and washing machines.
GDP per unit of energy use (constant 2011 PPP $ per kg of oil equivalent)
EU: https://data.worldbank.org/indicator/EG.GDP.PUSE.KO.PP.KD?lo...
US: https://data.worldbank.org/indicator/EG.GDP.PUSE.KO.PP.KD?lo...