There’s a big difference between “I’ve been practicing a bunch of different parts of a thing and now I can actually do the thing pretty decently” and “I have never done this thing before and suddenly I am doing the thing at a semi-pro level”.
To use your example, this article is about people who had never played piano in their life, but suddenly sat in front of one and started flawlessly improvising the blues without all that time practicing the different parts of the blues...
To use your example, this article is about people who had never played piano in their life, but suddenly sat in front of one and started flawlessly improvising the blues without all that time practicing the different parts of the blues...