I'm an alcoholic and am tapering down right now.. I can say he isn't an alcoholic and doesn't have an alcohol problem if what you say is true..

However if he is hiding his drinking and does drink daily then this changes things.. If he only drinks what you say he does and doesn't drink daily then there is no need for him to taper.. He can just quit, by alcoholics standards he isn't drinking a lot, nor will he be allowed in rehab at that little amount of alcohol..

It's more important to find out why he's drinking in the first place.. Is it stress? Anxiety? If he isn't drinking daily then it isn't because he's an alcoholic..