could be true, but it's definately not much lower, I can see abs well, and from experience seeing people, I had guessed my bodyfat to be 8ish as have other people, so I have a feeling it's somewhat accurate...
Im about 12-13% with proper lighting my abs show (top4) but im holding a ton of water right now due to sodium levels. btw I am 5'6 and 84kg (184.8 lb I believe)