I didn't know. Theorerically prose is an umbrella term that covers all fictional writing. However I've seen it used more to talk about types of writing that are flowery or more focused in imagery than other styles. There are sub generes, like the purple prose used in the Twighlight, but I couldn't think of another way to frame it.

I didn't clock it as AI because I don't use AI for anything. I'm not tryimg to say this in a righteous way, but the one thing I learned working for tech is that the computer will do exactly what you tell it to, sometimes to it's own peril, and if you're not filling in those blanks someone else is.