The paper you linked doesn't report the correlation as far as I could see, but it did cite a paper that said it was 0.86[0]. That's great for a social sciences correlation, but not so great as a way to be fair. 0.86 leaves a lot of room for other processes - and in competitive scenarios at the top of the distribution, the confounders could make all the difference.

[0] https://pubmed.ncbi.nlm.nih.gov/15147489/