The same rules allowing Delta’s club lounge to serve alcohol despite the Michigan governor’s order closing bars should apply equally to restaurants in the airport for those who don’t have club membership and are willing to pay for a drink.
However it seems a lot easier for people to drink alone, as Michigan’s governor seems to prefer people in her state do, than make a trip out to the airport just for liquor. It would be fascinating to see Delta’s internal data over the next three weeks about whether alcohol consumption continues to track with passenger numbers, or whether it increases on a per-admittance basis in to the club.