OK, so, fortunately, I was able to locate the idea within a minute and a half, and it makes more sense to me now. He's not trying to charm us with his fire-breathing at State of the Union addresses—it's how he is getting apostate republicans in line for the budget vote, using good cop techniques, or at least balancing it with his more natural bad cop:
Although honey, vinegar, cement, and iron sounds more like something RFK Jr would recommend to prevent measles, COVID, and AIDS.