That synopsis is misleading, he didn't program the game, he simply played a popular game where you can create your own world.
After you finish the game you can let it become public so that others can come in to play (or destroy).
Okay, a "programmer"/gamer doesn't know how to ctrl+alt+del a hanged game? Also, the guy basically played a fancy Minecraft so pretty much just an average game addict and not anything close to a programmer at all.