The equation isn’t just ‘environment transformed by technology’. It has other terms, including ‘energy’. We are not overpopulated now as long as we are happy to have billions of people subsisting on an energy diet that is a fraction of the US/Europe. If they begin to access the available energy, or that energy runs out, we are overpopulated. If we don’t find new sources (looking at you, fusion), we better learn to soft-land our culture.