I wouldn't read too much into these descriptions. We like to make up adjectives to describe great people all the time - these are not always rooted in any kind of quantifiable fact. It is not likely that you would become as good as Botvinnik by "copying his style", if that even means something more than "play the same openings".
Having said that, I believe that Botvinnik was, in addition to a great chess player, also a great computer scientist. He was one of the pioneers in using computers to analyze chess positions - hence a possible clue as to where the "scientific" angle comes from. Whether his chess prowess was improved as a result of this work is highly doubtful though.
As for "crystal-clear", that sounds to me like the typical thing you would say if you are looking to praise a man of great skill without committing yourself to what you are actually saying. I mean, it's not like you can somehow disprove it.