Earlier quoted context omitted.
The point is that they don't end up out of work. We have more automation right now than at pretty much any other point in history, and the unemployment rate is not high.
The point is that the unemployed end up using violence. So you need to create employment to keep them out of trouble.
Suppose that robots and AIs can't grow and distribute food, build housing, provide healthcare or produce and maintain robots. Then there will be necessary jobs for people.
Suppose that they can. Then all of those things will be near-free because they can be mass produced with no labor cost and you'll only have to make a trivial amount of money to have food, shelter and medicine. The low cost of living causes a living wage to be so easy to achieve that even extremely low value work pays more than that, creating jobs for anyone who wants one because so much work is viable at that price.