This is a bit confusing because it uses "elaboration" in a different way to the literature on learning and memory. Like with spaced repetition, we know that elaboration (i.e. explaining concepts recalled from memory without reference to the source material) is a great way to learn new information. See Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving Students’ Learning With Effective Learning Techniques: Promising Directions From Cognitive and Educational Psychology. Psychological Science in the Public Interest, 14(1), 4–58.