. . note that they use "Experience Curve" as a "disambiguation" of the major heading "Learning Curve" - and the other definitions are TV shows or bands.

Calling it an "Experience Curve" is probably a recent attempt to overcome the total misuse of the term "Learning Curve" in current speech.

We always called it "Learning Curve", and the government auditors called it "Learning Curve", and my book of tables is titled "Cumulative Average Learning".