A pitch that is primarily thrown with 2 strikes will have better results than a pitch thrown early in the count, or when behind in the count.
The data very clearly shows how much the split moves compared to other splits thrown by other MLB pitchers. That data is objective and irrefutable, and it very clearly shows the pitch itself isn’t overly remarkable. I’m not sure why folks insist on arguing against factual data.
It’s nothing more than arguing semantics because the data doesn’t match the narrative some people have in their heads. A pitch that pairs well with another pitch is not deadly, rather the combination of pitches is deadly, and the other pitch is just as deadly. The fact one is typically thrown after the other doesn’t make the latter pitch more remarkable.