DEI started as exactly what the original poster stated. It then has transformed many times, including through quotas (ruled unconstitutional in the 70s), and something similar to what you're talking about, to the more modern notion which is more about getting the best candidates from all populations.
The only place I can think of where the opposite is with college admissions, but college admissions is a weird thing in general in that I've never understood why admissions is tied to a stronger academic record (ties into, what's the goal of a given college). In areas such as sports, the impact has been even greater -- and there it's not even colorblind, but simply opened up the pool, and is more metrics driven than just about any profession.
Is there an example where colorblind hiring had a nil or opposite effect? In places I've seen, the opposite has happened. For example, https://www.ashkingroup.com/insights-media/the-power-of-blin...
The only place I can think of where the opposite is with college admissions, but college admissions is a weird thing in general in that I've never understood why admissions is tied to a stronger academic record (ties into, what's the goal of a given college). In areas such as sports, the impact has been even greater -- and there it's not even colorblind, but simply opened up the pool, and is more metrics driven than just about any profession.