If AH were to apologize, an apology for the drinking itself would be low on the list of things I'd think I'd care for him to apologize for.
His behavior has been abhorrent with and without alcohol and frankly his drinking had very little to do with how nasty a human being he became over the years.
I think that apologizing for drinking makes it seem that the behaviors are all attributable to the act of drinking itself when in my experience, AH's alcoholic/abusive behaviors occurred all the time-- drinking had nothing to do with it.
Not sure if that answers your question but that's my 2 cents.