The parent is saying that it is in professional games, but that that doesn't mean it requires legislation making cheating in all games explicitly illegal. Penalties in sports are commonly enforced primarily through the organisations running the sport, and only some offenses even involve actual law. If you cause someone financial harm, it's very likely already illegal.
Match-fixing in professional games is clearly fraud, that doesn't mean that letting your friend win because it is his birthday should be prosecutable.
I'd personally be okay with making cheating in multiplayer games illegal (it's purely antisocial behavior that causes real financial harm and has no legitimate reason to exist), but prosecuting people who write code is beyond the pale.
Match-fixing in professional games is clearly fraud, that doesn't mean that letting your friend win because it is his birthday should be prosecutable.