Neil Cicierega had a cousin who went by the name “Thunder Clap” and was seen as an online legend who created dubstep music. He died and everyone made a whole bunch of tributes to him.
the cybergrind terminals having a custom music playlist that v1 can access implies all of the music that you, the player upload into the game is music that was not only produced in the world of ultrakill but also considered important enough by the terminals to keep around for the possibility of machines entering the cybergrind in order to keep them coming back and enriched, since machines have an appreciation of music that the terminals already use to lure them in and develop a symbiotic relationship with them
this means 100 gecs can be canon to the world of ultrakill along with neil ciceriga, should you upload their music into your cybergrind playlist.