That's exactly what I think happened with CS losing her rights.
As far as AM is concerned, there is a whole different thinking as far as past criminal behavior when it's the biological parent versus a foster parent. We have clients we represent who are IN prison who have not terminated their parental rights (not for crimes against children). Their children are typically in a guardianship, and often they're not ever reunited. But there are some that, when released, go through the steps to terminate guardianship and regain custody. The kids aren't just handed over to them, it's usually a slow process, and they have to show employment, a proper living situation, sobriety, and plead their case. All things he could have done within that year or so chunk of time.
I have no idea if this is what happened with AM, but it's a scenario that could have happened, and if the wardship/guardianship were terminated, DCYF would have no involvement unless they were reported again. I'm also basing this on my experience within the juvenile court system in my state, it may be different in other states. Criminal history doesn't preclude a person from having children. There isn't really a lot of forgiveness if you're looking to become a foster parent, but parental rights are not so easily terminated for a biological parent.