The term is, the tech isn't. Apple does this with lots of things, like calling OLED displays 'Super Retina'; it both is and isn't true that only Apple products have super retina displays.
I think the distinguishing feature of displays branded “Super Retina” is the high pixel density (around 460 ppi). They have lower density OLED displays that they just call “Retina”.
That the term essentially didn't exist (1/100 "interest") until Apple rolled it out in Sep 2020 (with some press the summer before).
The general idea of a 3D effect on headphones has been around for decades, often called "3D audio" or similar [1], but I never heard the term "spatial audio" until Apple marketed it.
https://developer.apple.com/videos/play/wwdc2021/10265/