Most terms pages exist to limit liability, and the medical language in them is copied from somewhere else. On a site about borderline personality disorder that language is doing real work and is worth stating properly rather than pasting.
The specific risk is not that someone reads inaccurate information. It is that reading feels like progress. Understanding your patterns, acquiring vocabulary, recognising yourself in a description — all of that produces a genuine sense of movement, and it can substitute for making the appointment, indefinitely.
So the disclaimer is not only a legal formality. If you are struggling, the useful action is contacting a professional, and everything on this site works better alongside that than instead of it. The book says the same thing about itself, repeatedly.
And if things are escalating rather than steady — if you are less safe than you were, or coping is failing — please stop reading and use the crisis page. That is the one situation where this site has nothing useful to offer.
The most common harm from a site like this is someone reading it instead of getting help.