Maybe the end result is the same but it's an important distinction. It's too easy to say "oh yeah I'm gaining weight because I have sleep apnea" while you're snacking on donuts at your desk at all. The people who are tricked into believing it think that if they "cure" their apnea they'll be back to a healthy weight when a) they could be at a healthy weight despite their apnea with some effort, and b) they're building habits that even if their apnea disappears a year from now they will stay at the same weight.