He probably is genuine about hating heroin. During my addiction, i hated drugs and alcohol, but that didn't stop me taking them. I despised the alcohol i was pouring down my neck everyday for years before i got sober. It sounds totally nonsensical but it is the truth.
I'm sure that doesn't give you any peace of mind, but you and your AH are in my thoughts and prayers. Recovery from addiction happens every day in every country in the world. Even in seemingly the most unlikely of situations. I pray that your AH will come into recovery and your family will be granted some peace. Stay strong. x