The image is a joke, and is a gross misrepresentation of how it works. Well, almost.   NTRBootHax, formerly known as MagnetHax, has been released for public usage. Earlier this year, with a combined usage of a Magnet and a NDS Flashcart, @SciresM demonstrated in a video that he gained early access to bootrom of the 3DS. This method is also said to be able to salvage 3DSs' from the hell, that made them effectively a brick.   A magnet is only required for models that can be "f