I looked at that link briefly. It might be fine. Sounds like it is send several hundred dollars and get a manaul to read thing ... that was my impression from quick glance. Maybe i missed something.
If you have a serious pornography or sexual addiction, i would see a local psychologist who specializes in working on those problems. That's me; that's how I would do it.
Books can work wonders, much can be leaned that way ... but for a sexual addicition, I think face to face therapy might be necessary to be most effective. That's merely my opinion.
rob