Madison Square Garden's surveillance banned this fan over his T-shirt design

I don't understand why there's so much focus on facial recognition on this article?

The guy's name was known from social media, and his name was on his ticket, presumably. He was then asked for his ID to verify his identity (confirm he was the person on the list), and then kicked out.

I don't see where in that any kind of facial recognition was necessary?

There must be many thousands of people named Frank Miller, Jr. So something in addition to the name had to be used.