I've written about disclaimers many times over many years, both in the context of provider ads and hobbyist reviews. The theory behind both is essentially the same -- that a defendant can defend against criminal liability based on a statement they make which purports to negate the conduct which would constitute the offense. Example: A defendant states, "I'm not going to shoot you in the head, Bruno." Then he shoots Bruno in the head. Such disclaimers are without legal significance and, in fact, may be harmful by creating a false sense of immunity.
I wrote at length about disclaimers in provider ads here:
"Disclaimers in Provider Ads -- Do They Negate Criminal Liability?"