Spoofing - ok, but how did they detect all the starlinks? Assuming that users were smart to not turn on WiFi on starlink. Do these antennas emit certain waves t

Spoofing - ok, but how did they detect all the starlinks? Assuming that users were smart to not turn on WiFi on starlink. Do these antennas emit certain waves that a “scanner” can detect and with 99% certainty figure out that that point on a map is a starlink antenna ?