Only one chopstick appears to have an electrode, while the wristband looks like a ground contact. This device looks like it makes a circuit from the chopsticks, through your mouth and body to your arm.
Yup, the "sodium ion" thing sounds like BS. Almost certainly this thing, if it does anything, is merely shocking the tongue at a voltage/current that's high enough to be detected, low enough that you don't know you are being shocked.
Whether or not that "confuses" you into thinking this is salty, IDK.
Whether or not that "confuses" you into thinking this is salty, IDK.