As the article says, waiters at upscale restaurants are worse off in this system, because the system is now less unequal in their favor. If this became a trend

As the article says, waiters at upscale restaurants are worse off in this system, because the system is now less unequal in their favor. If this became a trend at lower end restaurants, waiters that don't make much in tip would make more money (and more stably). So this actually has the opposite effect; it reduces inequality.