A fair answer to the “how can this be faster?” question
Why many adults feel progress faster
The reason is simple: this method is not trying to teach everything traditional piano teaches.
Traditional piano can be wonderful, but it often includes reading notation, scales, fingering systems, sight reading, theory, melody playing, and performance skills.
This method focuses on a narrower goal: helping regular adults begin making music with simple chords, accompaniment, songs, and intuition.