Is Valley Fair mall's security robot using facial recognition?

The first rule about the mall robot appears to be: "Don't talk about the mall robot." Stanford Shopping Center in Palo Alto had mall robots, one of which was famously accused of knocking over a small child. How many robots did the posh mall have at the time? How many does it have now? When and why did the shopping center rid itself of autonomous patrollers? The shopping center declined to say.