someone else. So I can't really answer your first two questions.
For your third question, it's when anyone says it, but especially church leaders. My initial thoughts and experiences are that the Church as an organization doesn't have much addiction recovery experience compared to AA, SA, NA, etc.
With that said, I also recognize that people like Elder Christofferson are significantly smarter than I am in just about every subject on earth, so despite my cringing, I could off in my understanding on that particular quote and subject.