i thought they said average score doesn’t correlate at all with how you do once you’re in? a lot of high performers only get in 2nd or 3rd time and barely.
However, as of 2014 average interview score was very well correlated with job performance (I can't give you further exact details because they are still marked confidential and i can't find a paper or anything that has disclosed it).
Note very clearly the word average above ;) Individual interview scores are definitely not predictive of job performance.