but I feel that unless the addictions are dealt with it is all pointless.
Your husband has to want to address that issue, it's up to him to seek help for that not a marriage counselor to do. It sounds like the marriage counselor is working on marriage type issues, communication is a big one. But if you thought that going to marriage counseling was going to force him to address something he continues to refuse to do and has said he won't then ya maybe it is pointless.
I think you need to ask yourself what your real motive behind marriage counseling is. Because with him actively drinking it sounds like there will always be trust issues. But no one but no one is going to force him to stop until he decides that for himself.