Again, he wasn't at a bar, frathouse or a liquor store, he's taking part in an entertainment production. The rules are different, both in how the alcohol is provided, the level of insurance policy and required practices in said policy. Allowing participants to consume enough alcohol to experience significant inebriation would require production insurance in the high six figure, low seven figure mark, and would require constant required monitoring of actions and state.
Just look at actual reality shows. Even minor injuries cause a dead halt to whatever action is on-going while the person is inspected by a medical team and the injured party has to sign waivers at some point shortly thereafter before they go back in. For movies and other non-reality shows, injuries mean dead halt in filming 99% of the time until the issue is resolved.
Yes it's autistic. All legal and liability shit is hyper-autistic. But ignore it at your financial peril. You'll get away with it often enough, but it will eventually get you. Especially if you film it 24/7 in front of a live audience.