I'm not sure about the extent (e.g., 30% adhere to some form of theistic personalism, 25% adhere to classical theism, etc.) to which theologians disagree over the nature of god, however their agreement is ultimately irrelevant. Truth is not a game of credibility, although that sure helps in the art of convincing another person. I do know that this move was heavily influenced by the practical success of the natural sciences and inevitably resulted in scientism conquering every branch of knowledge, which includes philosophy. But I digress...
You may want to reread the sentence right before that excerpt.
Those distinctions are merely to help people understand the nature of God. In the Scholastics (read: St. Aquinas and co.) metaphysics that provides the foundation of divine simplicity, there is no distinction in his attributes as he does not have attributes but is actually that attribute. He is goodness, he is power, he is existence. That is merely a tool to help us understand that vastness of what God is. Also, God has no "person" per se, however he is the attributes (e.g., intellect, will) that exemplifies what we would call a person.