Well, I suppose that wondering about the intentions of others could only lead to assumptions and that will certainly not serve any purpose. So what ever the purpose behind the critiques, they are clearly written by those who interpret NLP quite different from those who understand what NLP is about.
And that is exactly what NLP respects; the fact that we have all got our unique interpretation of our surrounding.
Understanding of the latter presupposition would most likely refrain these hypnotherapists from publishing their posts.