There's words....and actions. So far he's talking about the mandated classes and getting a counselor...but he hasn't done either yet. Talk...not action. He's not drinking in the moment, but it's early on that one so I wouldn't put a lot of weight on it.
You can remain detached from all of this, and still be a nice person. Letting him handle his legal issues, find a way to get to work, etc are all great boundaries. He will experience the consequences of his actions. He will get the message that you're done enabling him. This doesn't have to be a huge announcement, your own actions will send the message. But you don't have to give him the cold shoulder to accomplish this. You were upset by his drinking...you set boundaries...now let it go. Anger helped you make the decision, so there was a purpose for the emotion. Stick with your boundaries, and try to be peaceful.