eh kinda. I started doing that but then I got annoyed. The one I use just says to pinch around your belly. Suprailiac is the correct term. Look at the number I pinched, then track that.
Yeah that's what they say on the one I got, but they also have where you have someone help you and they measure your fat on your shoulder blades, triceps, and maybe one other place. I'd guess that measuring at your suprailiac would be pretty close, but if you're measuring in other places probably slightly more accurate but much less convenient.