I think the hardest thing about combining NLP/hypnosis with low carbing is that if the person influencing your mind doesn't get low carbing they can say well meant things that are counter-productive to the low-carb cause. The lovely lady that did my hypnosis would have a pre-hypno pep-talk and she'd often say things like 'have less butter on your jacket potato, or use low-fat spread instead.' 
I had to put her right on a few things!
The PM book says a few things which I have to filter out too; it's all very well telling people that you can eat anything you want in moderation, and there is no harm in giving in to doughnut urges so long as you only eat one a week and not four a day, but that's not much help if you are trying to stay in ketosis with four stone to lose, and you really understand what it is that carbs do to sabotage you, in terms of leading you to an endless cycle of over-eating. Those messages are fine for people who want to maintain, and have gained control, but you'd be there for a fecking long time trying to shift any major weight initially.
One thing I've realised is that there are two factors at play here - the biological urge to over-eat that is carb-induced; that cycle of hunger/eat carbs/insulin spike/crash/lethargy/hunger etc, but also the mental urge to over-eat, and that can be triggered differently for everybody. It can be a displacement activity, or a sub-conscious habit, or a form of self-medication. Where some people smoke, some self-harm, some drink too much, others need to eat. Sometimes it is a reaction to boredom or stress, self loathing, self esteem issues that need properly sorting out, and sometimes it's nothing that exciting - just an inability to recogonise and react to the the feeling of impending fullness, or eating on automatic pilot without engaging all your senses.
That's what happens when you sit in front of X Factor and eat an entire box of Maltesers or an entire tub of Haagan Daz, and not actually noticing that you ceased to really enjoy it at the halfway point. 
So, I had to steer the hypnosis a bit by explaining to my therapist that I believed wholeheartedly that low-carbing was the most sensible way to eat in the long term, and for her to fill my head with mixed messages about so-called 'healthy eating' would be counter-productive. She also taught me lots of little strategies and visualisation techniques that were very helpful, even though over time I have become a little lazy about using them. Many of them are the same or similar as PM's.
For me I feel the two have worked quite well together. My head is in a better place which makes it easier to resist the urge to cheat and have major blow-outs.