Negative, it's a movie reference from the original "Red Dawn", which is where "John has a long mustache" comes from too. Kbop recognized the reference. Resistance messages were broadcast by clandestine transmitters, and hidden messages were embedded in their transmissions. It's a great movie, the remake was mediocre, using North Koreans as the enemy forces, though it was suppose to be Chinese forces, but the Chinese were financially backing the film, so the North Koreans became the bad guys. You'll see occasional references to "John has a long mustache", when someone wants to clue another one that there's a hidden meaning in what is being said or written.
