Amazon always wants as much as it can automated, they devote an enormous amount of money to that. This is not going to move the needle on something they were already dedicated to.
And that argument is almost always silly. All of these big companies are devoting resources all the time to reducing payroll. It is banged into their heads in MBA schools that "payroll is your biggest expense", and that is a bad thing. With that mindset they are always looking to reduce payroll.