That story was told over first hand in public countless times by Rav Gorelick, and Rav Berel Soloveichik in Brisk of Yerushalayim used to tell it to his Talmidim as an example of what the Chofetz Chaim held of Rav Kook.
This isn’t any secret and can be confirmed by numerous talmidim of theirs first-hand. Btw, who is “AJ”?