IIRC, he didn’t even buy the ticket? At no point was his name used in the transaction, so how exactly did they know this person was at MSG in the first place? The conjecture is facial recognition.
Most venues require a name on the ticket, and many will validate that the person holding the ticket is the person who is named on the ticket.
This is a very common anti-scalping measure.
Maybe for Taylor swift tickets or something they have stronger rules but it’s definitely not true as a matter of course in American major professional sports that each ticket holder needs to have their identity on file
source: literally seen quite a few hundreds of concerts.