You are too kind when you suggest he simply “forgot” to refer back.
I think he purposely has rejected scripture.
Well, I don’t know the guy. I’d need to know more before I judged accurately. Its just that I have seen this kind of thing before. People concentrate so hard on one particular aspect of faith/truth/scripture that they neglect other parts, and end up perverting the whole of the message. Its a snare to intellectual believers.