Smart-Phones Destroying Worker Productivity ???

Is smart-phone use destroying the productivity of US workers? This report says "yes":

http://www.zerohedge.com/news/2017-09-30/increase-americas-productivity-ban

It also makes an interesting claim, which I find to be completely believable:

If we isolate the last 15 years, US productivity growth is on par with what an agrarian slave economy was able to achieve 200 years ago.

Put your damn phone down and get back to work !!!

Hint: If you don't, you'll be replaced with a robot.