Well he sounds about 99% better than most addicts.
My grandfather drank 1/2 bottle of amerato daily until he died at 96. He died of prostate cancer which could have been avoided had he been to a doctor and he had not been to a dr in 50 yrs.
Not saying drinking is excess in any way is healthy, but not every drinker gets progressive or gets sick from booze.
More people die from smoking 2 packs of smokes a day.
Is he having health issues?
If he doesn't drink during the week or all night, are you saying he only drinks 8 beers a day on weekend?