Scientists in Germany have demonstrated a startling new form of surveillance: identifying people using nothing more than ordinary WiFi signals. By analyzing how radio waves bounce around a room, researchers can effectively “see” and recognize individuals — even if they are not carrying a device and even if their phone is turned off.
A sufficient fix is not letting your wifi devices connect to your neighbor’s network so their router can detect you walking between it and them.
my devices don’t, but unless I misunderstood it it does not matter whether you are connected to the neighbor’s router