The author has found that, in his experience, some (maybe many) victims of continued domestic abuse stay with their abusers because they simply continue doing what they've always done. Or perhaps the abuser "needs them" in some capacity. So the authors solution is to encourage and explain to victims that they can choose a different path in life and that their abusers may in fact not need them at all. It seems the author believes that a lack of self interest can be a contributing factor in continued abuse and that the solution is to increase the victims sense of self-worth and self-determination.
I don't believe that this solution will always be beneficial. Or that domestic abuse is in some way the victim's fault but the author does present an interesting argument for the benefit of asking the question "what do you get out of this relationship?" And has, at least anecdotally, found some positive results from doing so.