No he didn’t. He suggested we’d have chosen to work fewer hours and have more leisure because we could afford both greater consumption and greater leisure than were possible when he wrote. Higher wages than now, with shorter work hours than now is possible only with growth in economic productivity so we can produce more (goods, services) with less (material input, labour). We can’t just decide to work 20 hours a week and maintain our current standard of living by fiat.
Economic Possibilities for our Grandchildren (1930)
https://assets.aspeninstitute.org/content/uploads/files/cont...