They do that at Circle K[0] today using the same tech from Mashgin. It's meant to be a self-checkout, but you literally have one employee standing and watching this one checkout (sometimes 2-3, but usually 1-2). It's not always accurate, requires some hand-holding at times, and slows down the already slow lines at Circle K. It's a bit faster than the article implies and does not require a staff member, but still slower than a human would be.
Meanwhile over at QuikTrip, there's one person checking out two people at a time. Suffice to say, if both stores are available, I will always choose the QT.