>It seems fairly obvious that any new automated technology removes more jobs than it creates.

Widget A has $10 labor costs and $10 material costs. Widget B has $2 robot costs (=robot engineers labor) and $10 material costs.

My budget is $200. When I buy 10 Widget B I will have $80 remaining that I can spend on something else which will pay someone else's salary and therefore create at least as many jobs as were destroyed by the robot.