Correction: Hans Kung is NOT a Catholic theologian. He calls himself “catholic,” and he used to be a “priest.” He has deliberately cut himself off from any legitimate attachment to the Roman Catholic Church. He is a liar and a charlatan, but he is NOT a Catholic theologian. Time for the woodshed for the writer of this article.
“...this sacred congregation by reason of its duty is constrained to declare that Professor Hans Küng, in his writings, has departed from the integral truth of Catholic faith, and therefore he can no longer be considered a Catholic theologian nor function as such in a teaching role.”
Here’s the link from the 1979 document from the Congregation for the Doctrine of the Faith: