Right. Because this proved true in the last 150 years of 10,000 years of human history it can never prove false.
Productivity improvements have been occurring for a lot longer than 150 years. Agriculture has been around for 10,000 years. Writing, paper, concrete, and steel are all technologies invented more than a thousand years ago.
Can you name any productivity improvement, ever, that did not lead to higher living standards?
Most AI-chicken-littles predicate their doom-and-gloom on the assumption that only "the rich" will have access to new technology. The same predictions were made about cars, personal computers, and even washing machines. Yet today, car ownership is widespread, and billions of people have a computer in their pocket. There is no reason to believe the future will be different. It is not just "the rich" that have Siri on their cellphones. Household robots will almost certainly be designed for the mass market, not the 1%.
Can you name any productivity enhancing technology, ever, that has been used solely by "the rich"?