This is not correct. From the Catholic Encyclopedia,
It is principally on the strength of these Scriptural texts, harmonized with the general doctrine of the Fall and Redemption of mankind, that Catholic tradition has defended the existence of the limbus patrum as a temporary state or place of happiness distinct from Purgatory.
Good catch! The article is, after all, novus ordo.
Re-reading your post, I do not agree with the encyclopedia. I always understood that Limbo was eternal. I don't understand how they can say otherwise.