I think their point is, if it were 10ml smaller, it would be allowed - and it’s half empty, so there is clearly less than the permitted 100ml of liquid inside.
As for the booze, that in theory isn’t allowed even in business class, because they want to be able to cut you off before you get too drunk. Belligerently drunk passengers have caused planes to turn back to the gate, which is expensive and a hassle for everyone on board.
