I respect the opinions of the other posters here a great deal, but he's simply using Alanon to avoid AA and the idea that he's an alcoholic.
He's in denial about his alcoholism and Alanon won't be very useful in that regard because it's focused on how the drinking of others has affected us. If he keeps the focus there he gets to not focus on his own drinking problems.
And, regardless, it doesn't matter anyway. What matters is if it's a problem for you and it is. Enough said.
Cyranoak