I also find the original screengrab posted by OP to be kind of sensationalist. I have no idea what that image of the man is, it doesn't appear to be sourced from the researchers here: Christian Kell and colleagues working with an anonymous research participant. I think it's very misleading to call this "a biological miracle" and to claim that "fluency is instant." These are very early stages of research, and **partial** fluency was achieved over weeks of treatment. This is not a "pacemaker" (decent analogy, but not literally the same) and nobody "STOPPED" stuttering (factually incorrect about the most important piece of information). This is a biomedical device that isn't related to "speech therapy," and the graphics showing that headband device and holograms of the brain seem like they were just made up so that it would look like science fiction. All of this is to say: don't believe what you see on Facebook. Even if there are kernels of truth, it's wrapped up in emotionally charged distortions and outright fabrications.