This article is the kind of sensationalism that discredits very real concerns about a technology by bundling all use cases up with a big, scary bow.
Surely you're not suggesting that human managers and a 24/7 machine learning-powered surveillance system are the same? We expect managers to do their rounds through the kitchen and the dining room to check on both customers and employees, and to speak with people directly so that they can understand the many nuances of why things are the way they are that come with running a restaurant. Cameras placed above diners feeding raw data to management at the end of the day not only A.) Doesn't allow issues to be resolved as they're happening, and B.) Does not take into account the variety of nuances that occur in a restaurant on a nightly basis.
Managers can be sent texts in real-time if, say, the number of people waiting for a table exceeds a certain threshold, but c'mon, is it truly cost-effective? Why implement costly machine learning software, and place the extra stress of 24/7 job performance surveillance on your employees, for something like this if your waitlist is managed digitally and you can easily look at the total number of people waiting? Even if it's not managed digitally, it's easy to look at a sheet of paper or a crowd in front of you and know that you've got a problem.