It's false. The Djinn skin puts you at a DISADVANTAGE because of how easy you are to spot. Much like the doughnut skins, people will most likely shoot someone on fire before they shoot a regular custom character.
But donut skins are advantageous. I put up a hitbox video a while back showing that they're good because unless people shoot center mass, they'll shoot the extra flab with no Hitboxes. The opposite is why skeletons are bad.