What a ridiculous article.
First, it's not an "unmanned tower," it's an un-towered man. There will be a controller (or controllers), they just won't be sitting in a tower overlooking the field directly. The article doesn't even address the question of where the controller(s) will be operating, although the video explains that he/they will be in a shack on the airport site.
The video also hints at what my immediate thought was -- if this can all be done by digital displays, there's no reason why the controller(s) have to be on-site at the airport. They could set up a regional or state facility that handles a number of airports from one building.