So... when I played Cyberpunk 77 around a year ago on my PC, I did a whole bunch of edits to config files.
I found some interesting stuff like hidden debug menus, hidden UI options menus, I tweaked a bunch of engine parameters to optimize view distance and object detail and lods, and I altered some root character model paths.
I realize this will sound incredible, as I have no proof after my PC was stolen...
But Elon's face is in the game, same way Allahnah's hair is, Keanu Reeves's face is.
Elon specifically only ever shows up as a possible face model for the cops, the NCPD.
I have no idea if this is still in the game files, as its possible that I could only see it because I messed around with root character model file paths to get more variety from random male and female npcs.
Funnier still: Elon's face is always paired with a balding male hairstyle.