Your source talks about the consumption once it is off the ground. My understanding is that taking off requires more energy than maintaining height and speed like it works for literally every other vehicle.
What does flying 300 miles look like in terms of fuel consumption
If he has a single drink a day he’s not an alcoholic by most standards. It’s only in the trash DARE adjacent programs that nonsense like that is taught.
It’s also possible that most of those bottles are partially full. You don’t have to kill a bottle if spirits nearly as quickly as almost anything else.
That being said if they are empty and he’s keeping them around as a decoration that must be stopped. There are very few empty bottles that really hold sentimental value to the point where you should keep them. Most empties are trash
I used to buy for a liquor store. There are tons of whiskey people who open bottles but don’t finish them. He might be an alcoholic or he could be one of those guys. We don’t know why they broke up.