While Elon's then-partner Grimes was recording her part in the game as cyborg popstar Lizzy Wizzy, the erratic tech billionaire turned up with an antique firearm to "insist" on being included in the game. "The studio guys were like sweating," Grimes is quoted as saying. Musk adds "I told them that I was armed but not dangerous".
Apparently, the developers relented at the time, though it's unclear if Musk did actually get the cameo in the end.
Thanks for the explanation! It sounds fairly similar to the law here, where it’s based on what a reasonable person would believe - so even waving a realistic toy gun at someone would get someone in trouble, if the person being threatened with it would reasonably believe it was real.