This seems obviously wrong as there are many counter examples. Employees in Ford's plants for instance saw huge wage increases and an additional day off. Mining mechanization made mines far less deadly and greatly reduced the human exertion required. I'd much rather harvest corn in an air conditioned combine vs. with an ox.
Even during the early industrial revolution, notorious for poor working conditions, people overlook why there was such high demand for those shitty jobs. The reason is because people were literally starving in the countryside. A family's survival was dependent on a good harvest.