Moderate drinking for men is generally defined as 2 per day or 14 per week. For beer that is a 12 oz beer at 5%APV. So technically he can have a little more than 2 light beers per night and still be considered a moderate drinker. So the question is how often is it 3, not 2?
In any case, it is a lot, though is still considered moderate drinking, but healthwise even low amounts of alcohol affect not just the liver, but also the brain, gut, pancreas, lungs, cardiovascular system, immune system, and more. So no to al anon, but yes to having him do some reading up on his health risks.
https://www.niaaa.nih.gov/alcohols-effects-health/alcohols-effects-body