So apparently, this dude was on some old 1970s Bell helicopter that, due to U.S. sanctions, wasn't even, probably wasn't even maintenance correctly with parts and stuff, and also the fact that it had its transponder turned off for security reasons, but the other thing about this is, is probably using an old GPS receiver. So, no GLONASS, no BEIDOU, no nothing. Man, even my DJI drone has all three receivers.
The James Bond movie GoldenEye popularized the whole concept of EMP, Electromagnetic Pulse, but its second movie, successor movie, The Tomorrow Never Dies, was the first popularization of GPS spoofing. But in that case, it was spoofing a ship. However, nowadays, it's probably spoofing aircraft, especially helicopters in fog.