As far as I know, no online reference is available. If my memory serves me, the comment was made during a retreat at cult headquarters. His words were something like, "Some people ask if we are a cult... like we are going to drink the kool-aid... ha, ha, ha!" Perhaps someone else can corroborate this.
Forum: "Cults," Sects, and "New Religious Movements"

That's a sobering question. History has shown us that these situations tend to end badly. Mr. Moo-Young has even made reference to "drinking the kool-aid," accompanied by chuckles from him and the crowd. Some members of his cult would probably do absolutely anything he asks without hesitation.
Forum: "Cults," Sects, and "New Religious Movements"

From "Cults in Our Midst" by Margaret Thaler Singer. “A cult is a mirror of what is inside the cult leader. He has no restraints on him. He can make his fantasies and desires come alive in the world he creates around him. He can lead people to do his bidding. He can make the surrounding world really his world. What most cult leaders achieve is akin to the fantasies of a child at play,
Forum: "Cults," Sects, and "New Religious Movements"

Don't hold your breath waiting for Mr. Moo-Young to apologize. As a pathological narcissist, he is unable to offer a sincere apology. Strong charisma, seeming confidence, and overt grandiosity are all clues to the profound emotional insecurity that lies underneath. A pathological narcissist avoids admitting his errors or flaws, even to himself. Low self-esteem is too dangerous for him to
Forum: "Cults," Sects, and "New Religious Movements"