As the article suggests, during the industrial revolution there was not a true loss of employment opportunities. Employment shifted, weavers became machine technicians, horse buggy drivers became taxi drivers and car mechanics. Government regulations on mass production created an entire workforce artificially (inspectors and enforcement). In more recent times you have seen how farmers' children didn't remain farmers once industrial farms came about, they became agricultural and machine engineers, programmers etc.
Both the industrial agricultural growth in the West and reduced work week experiments In Europe caused a great deal of benefit. Farmers no longer had to work 16h days for 7 days/week and the children no longer had to help. All of a sudden there was a greater need for entertainment; the movie, music and video game industry exploded in the 90's (contrary to their own statements).
As AI grows (and it hasn't, AI is currently very rudimentary and task specific), the same effect will have to happen. People will be able to work less (30h/week, 20h/week) but people will have to understand the AI's and the ways it can fail which means more programmers, engineers and researchers. Also the entertainment industry will grow and as it grows, so do employment opportunities. People will always want to see people perform whether that is in sports, video games, music or movies, you will not be able to replace those for at least another century and at that point, current economies will have adapted or failed.