Actually, that is not true at all. Permissiveness usually produces children who push for boundaries because children need boundaries to feel safe, but some children are not high needers of strict boundaries and can do fine in a permissive environment. Typically, though, when you have more than one, or a less easy going child, permissiveness isn't going to help you at all. Permissiveness is the opposite end of the spectrum from Punitive and, just like a child who is easy going and a people pleaser may need only a few spankings before they change behavior, thus making some people think spankings work, Permissiveness can *work* as well.
GBD is Grace-Based Discipline and it speaks to an entirely different paradigm from the one that says you're either punitive or permissive. It rejects the extremes of both while providing a middle ground that is both kind and firm.
You can read more about it at my website
http://www.aolff.org and in the GD forum here.