There is some history behind that guidance at the top of the section, and having a separate section for NH at all.
The subject of NH (which is a designation I hate; what are the rest of us practicing, unnatural horsemanship?) is a very polarizing one on this forum, and often, if someone asked questions about a particular NH technique or practioner, it would turn into a huge, nasty debate about NH as a whole.
So a separate section was created for people who were interested in NH to discuss it without the validity of it being up for general debate.
Someone who does not care for donkeys would not go the section for "Other Equine" and talk about how much they don't like donkeys
Unfortunately, that's not true. Posters do that very thing, go on certain sections of the forum just to say "I can't stand ______(insert discipline, practice or trainer here)____" and it's not just NH that comes in for that treatement - hunters, Western Pleasure, barrel racing, dressage and gaited horses have all been bashed with a ferocity that is usually reserved for religon or politics.
So my recommendation to you would be to enjoy this section of the forum, and ignore derogatory posts about NH in other parts of the forum.