Sorry I am late to the party. However, I am not surprised at all about the Google study results as I suspect the large majority of Google STEM employees are H1B visa folks - meaning they are foreign born. As someone who spent most of my career in industry, and a reasonable amount in academia, I would argue that they are much less skilled in the 7 qualities of success than native born STEM employees. The cultural difference along with the way they were raised as children is much different than in the U.S. This was clearly apparent to me as a college instructor who had both types of students in class. In my specialty area of engineering electromagnetics, the main qualities for success in industry are being smart, creative, having gone to a top college - and being comfortable with the cultural environment. . I would estimate anyone who has those factors is smart enough to have observed and absorbed the Google qualities for success. The last of these factors is a stumbling block for many, but certainly not all, foreign born engineers/physicists.
I would also add that those who have those qualities will also be curious enough as adults to learn about humanities and social sciences. In my own case, I have learned enough to have made original contributions (but never bothered to publish) in history, geography, and OT studies. In fact, I have at least several hundred books in my personal library on religious and biblical studies, along with theology and philosophy.
Like it or not, I believe that the smartest students are attracted to the intellectual challenge of STEM majors. They are also the most likely ones to be good at critical thinking and complex reasoning. This is not meant to denigrate other areas of study - but if I am involved in determining the solution to a complex engineering problem, I want to have people like me on the team. Diversity, as much as it is touted, cannot be blindly applied. Cheers.