The thing is, unless the control system is set up to shut down the site (that "positive shut-down" thing is new to me), gas pumps (just like honey badger) don't care what the tank level is and will continue to dispense fuel until it goes dry.
I wrote code for automated gas station stuff back in the late '90s (6809 assembly code to talk to the pump and terminal; Gilbarco, Wayne, Tokheim and Schlumberger were the brands back in the day), and late one afternoon when I was on-site at a unattended station (we were testing cash acceptors), suddenly nobody could get gas. I was worried at first because I thought my code might have been the problem. Turned out that the tank of regular had gone dry, so you could only get premium. Because the site used "blender" pumps, you couldn't get mid-grade either. The pumps were apparently smart enough to know not to give you pure premium when this happened.
...which brings up the main point of having a tank monitor. It's not to tell the pumps or the unattended site control when the gas is empty, they know from the lack of product, it's to tell the company running the station when they need to send a truck out. So this is just as likely if not more so to cause an unnecessary truck roll.