Don’t they do that for card counters in blackjack.
Unless the slots were “fixed” he was just plain lucky.
People have found ways to go after slots. Some people have made electronic devices to affect them.
Hitting 10 major slot jackpots in 2 days will trip their security though. He’ll be banned. And they will pour through the tapes of him and see if they can spot anything, if they haven’t already.
And yes they do that for card counters. They normally now work in multi-people teams. They can usually find everyone on the team.