1. Music is inherently a technical, movement exercise, especially violin with the bowing. If you are not relaxed, if you are not muscularly efficient, if you're tense from overwork, you're going to play less well. So, those who are busy may simply be less good due to that residual tension and stress....and this is much less relevant to coding or purely intellectual work, which simply requires typing and not muscular fluidity.
2. Deliberate practice is extremely hard to measure by looking at someone's time journal...it's a modality of practice, a time journal is not going to gather that information. Just because the talented ones practiced in huge chunks of time, versus spaced out shorter chunks, how do we know they were drilling the hardest skills and analyzing their weaknesses?
3. Looking at students who have promise (according to their professors) is vastly different than looking at actual professionals. Many pupils were not esteemed or had mixed reviews from their professors, and then went on to great things. I'm thinking Debussy and Valentina Lisistsa, both of who did not succeed initially but whose great talent was revealed later on.