Respectfully, the user in question does not appear to be particularly outstanding, especially in comparison to other users that have been around for as long. That is not to say they are particularly bad, but you can point to more opportunities for improvement than opportunities to learn from.
It is entirely likely that this user was simply flying under the radar of users that would normally enforce a bit more quality control; since the initial post, all but one answer has been lowered to at least a score of 0. Several answers have also been deleted.
With a score of less than 125, the user has asked one question with an average score of 0, and provided
13 answers with an average score of roughly -0.25 -0.5. Without wanting to browse and vote on this users entire history, I have looked at their highest voted answer (without actually being accepted), and their lowest. In doing so, I felt obliged to cast one down vote, and refrained from further voting altogether.
The highest had a score of +2, but I felt it was posted with the intentions of a comment, and it doesn't seem to answer the question. This answer has since been removed, leaving only an accepted answer with a positive score. The lowest has a score of -6, and was a clear example of a codeing snippet without any explanation.