I'm still not convinced, and the proof I asked for is just the creator saying it is the best.
There is no adjustments made for pitchers with low k rates who consistently get hitters to hit into outs.
Again, I respect the attempt to minimize the impact of fielders on a pitcher's success, but by totally removing it from the equation, the low k great pitchers are penalized.
They have Wright as below avg while his ERA- was tremendous. That's a metric that also accounts for several factors.