What he's avoiding saying is that while the need to hire more people isn't going away those human workers displaced by technology will, in all likelihood, be out of a job because there is now a higher-order job that they are unqualified to do. The savings from from automating the warehouse gets reinvested back into Kiva systems, for example. And it's not a 1:1 replacement either as it takes the elimination of a handful of minimum wage warehouse workers to let Amazon hire just one more engineer.