I notice that quite often people on here spend a lot of time debating or making pronouncements on what defines an alcoholic, to them. And I am not sure that's always a helpful way to think about things.
I drank in a way that was problematic (I don't drink any more). But never had any sort of physical dependency on alcohol, so for a long time it was easy for me to tell myself "this is fine - I am not an alcoholic". When in reality my life is much better now I have stopped drinking.
The amount you have to drink to cause liver damage varies hugely from person to person, according to a nurse on the liver ward who I once spoke to about it. This is why you meet some people who drink a massive amount, including binging, but their (physical) health remains fine, while others might experience problems just from, say, half a bottle of wine with dinner every night over a prolonged period ....
This guy the OP talks about - we don't know for sure he is damaging his physical health, but there is certainly a risk of that (and it's not just the liver as we all know - risk of certain types of cancer increases with regular alcohol intake, etc etc). He is certainly also spending a fair amount of money on drink. (one massive benefit I noticed when I quit drinking, and smoking to be fair, was how much money I saved each month). And, you know, maybe he is a "nice drunk" as they go, but I have never met a single person whose personality was actively improved by alcohol - I am sure his family and friends would much rather spend time with a non-drunk version of him ....
So yes it would be better for him to stop doing this, definitely - doesn't really matter if we want to label him as an "alcoholic" or not.....