The results of studies like this depend strongly on the context... both the method used, and the existing hiring environment you're comparing to.

We've run a similar study and for the company we were hiring into we found blinding in that specific case had no effect on race or gender but drastically improved socio-economic diversity. The hiring company already had equitable hiring on gender & the candidate group wasn't racially diverse enough to make a conclusion.

Would I generalise that result to all organisations? No way, and neither should you.

If you can find the study you're thinking of I'd be interested to look at it.