My son is ODD and I've NEVER been told medication won't work, although we have chosen to not take that route. He has a counselor he really enjoys spending time with and a PSR (psychosocial rehabilitation) worker that comes into the home to help us AND him deal with his outbursts, etc. That has really helped a lot. We also have him on a low glycemic diet with various supplements to help him. One supplement he really enjoys is called Natural Calm. He has a glass every day when he gets home from school. (You can find it in powdered form at your local natural foods store or you can order it online.)
A friend of mine also has an ODD son that was really out of control (he's 13, was running away, etc.) and they did put him on medication. While he's still not a "normal" child, his behavior is much more manageable.
I would definitely get another opinion. I've never heard of this, although I would be willing to look into if I thought it might work even if insurance didn't pay for it. But only after doing a lot of research on it.
I read a little bit about it and one site said outright "It appears that Neurotherapy may address the underlying dysregulation and facilitate clinical treatment using cognitive and behavioural interventions. More research is needed in this area to determine whether Neurotherapy is directly responsible for this abatement or whether the resultant improvement in attention, and reduction in hyperactivity promotes better self image which in turn improves behaviour." While it is true this specific site was addressing ADHD, that often goes hand in hand with ODD and I read pretty much the same thing at other sites.
http://www.adhd.com.au/conduct.html
How old is your child? When was he diagnosed and how? You need to take all of that into account before choosing a course of action. There are so many options available. Good luck!