This seems to me like a good example of an interesting subject, edited into an overly-condensed article, and tagged with a catchy, but somewhat misleading title. I imagine it would be very difficult to control an experiment just on response to anger (as opposed to other emotions). Without seeing more detail, this article to me basically says that being self-aware and having a healthy understanding of the full range of one's natural emotions "is good for career." Doesn't seem particularly groundbreaking that anger would be included in that list.