There is no right or wrong thing you can say.
If he truly wants recovery he'll seek it regardless of what you say or do.
He has to want it more than you do.
He has to want it more than anything else.
I understand your need to speak your frustrations, your fears, your anger or whatever, but in this case, as in any other, before you say to your AH what is on your mind, you should consider what are you trying to achieve with it. Getting into arguments is not helpful to you IMHO. That's why it is adviced not to do it.
You can not talk him into recovery or out of it. You simply don't have that power. No one does. If you learn this to be true your own life will become much more simple. At least that was the case in my experience.
Try finding other ways for venting that would be more helpful to you. Keep it true to yourself that way. Excercise, do whatever, just stay away from trying to reason with an A, as it can not be done, you can only drive yourself crazy in the process.
Take care