This is excellent, even if it conflates mindfulness with meditation.
The first two are practicing meditation in a way that is highly satisfying. Meditation is NOT not thinking. It’s acknowledging that you thought something, then going back to the meditation. This helps us build mindfulness by creating purpose around paying attention (and not).
Lard is doing it. The girl is trying, but she’s adding judgment to the thoughts she’s letting go by instead of just letting them go.
Our little guy is lost in his thoughts, which is most of us most of the time. He’s not being present—central to mindfulness—because this thoughts are on a bunch of things that are NOT in his presence.