A lot of the problems I've experienced in the past few years were because I accepted legal advice from people who were not attorneys. I am assuming he is court ordered to pay child support. If he does not pay child support because he is going to meetings instead of working, how do you think that's going to play out? Do you think the judge will care one way or another what his sponsor has to say?
Personally, I think the busier he can be, the better. I do think it's a very good idea to go to as many meetings as possible, but not at the expense of following his court order.
But I'm glad to hear he's sober. That's excellent news. I hope you are making time to get help for yourself. Loving an addict (even one in recovery) can be very lonely and stressful.