Those moments always make me think they’re going for a scripted conversation style where the “learner” is picking up the thread too quickly and interjecting their epiphany inline for the benefit of the listener.
I guess I’d say “using it” should be steps 1, 2, and 3. Explaining it and writing about it are generous ways to share your understanding, but in my mind that’s a different goal.
Don’t write about it; use it. The real world application of a new skill fleshes out your understanding in a way that is less vulnerable to your own blind spots, is absorbed at a pre-lingual level (closer to your bare metal), and might actually produce something of value along the way.