From what I understand gaslighting is the term that describes someone suggesting a different reality to throw someone of balance. The effect is to make the other person unsure of themselves and easier to control. And you are right that is very intentional and a horrible thing to do to someone. In the article though we are talking about someone who will never admit they are wrong. To do so would shatter them psychologically. To avoid this they actual make up a false reality that in there mind lets them remain blameless. They aren't trying to manipulate someone else as to protect their ego.