Forum:OCG Rulings? (When to use)

On certain cards' Rulings Pages, it mentions OCG Rulings (example: Balloon Lizard). What exactly does this mean? Is this because the cards used in the OCg Ruling (in this case; Skill Drain) hadn't debuted in the TCG yet back then and the page simply hasn't been updated?

Or is it because the rules only apply in the OCG, and not in the TCG? The latter seems unlikely, but I'm not sure.