Did his work look only at people who passed the Google process? I would guess so, since he probably didn't have the resources to track down the careers of peop

Did his work look only at people who passed the Google process? I would guess so, since he probably didn't have the resources to track down the careers of people outside of Google. The statement "Amongst people who passed the Google interview, the technical screen had no connection with Google career success" is a very different statement than "no connection between technical interview performance and career performance" due to the selection bias.