The article you link says the judge already knew how to code beforehand.

He’s been coding in BASIC for decades, actually, writing programs for the fun of it: a program to play Bridge, written as a gift for his wife; an automatic solution for the board game Mastermind, which he is immensely fond of; and most ambitiously, a sprawling multifunctional program with a graphical interface that helps him with yet another of his many hobbies, ham radio.