The study of luck is called ludometrics (there are a few interesting papers related to sports on Arxiv). It is very tricky and there are several competing notions of luck...I am not convinced that the method in the article is particularly useful, particularly as it involves human decision-making where you see power laws all the time...which doesn't necessarily indicate luck. Maybe you could argue that the scale of the success is outsized but this is largely a function of the way people consume, not luck...I don't know, it is tricky (and I have spent a lot of time looking at this problem in sports).