That term existed well before SpaceX - From Bureau of Naval Personnel, 1970 - Fire control (Naval gunnery) https://books.google.com/books?id=86zpYQO5yYcC&q=Rapid%20uni...

and https://history.nasa.gov/monograph45.pdf

> We would build multiple layers of fuel oxidizer, and then, we would get a run long enough up to really do something. We’d get a really exciting event. I deemed it “pre-unplanned disassembly” at the time. That problem really went away when we learned a little bit about fuel control and kept injectors and propellant temperatures a little warmer.

Same as with Tesla, you test new algorithms in production and deny the consequences. Someone believes that you can do Agile development with safety critical systems that involves real lives and severe consequences.

You wouldn't know that from the way elmo has branded himself.