Yet it does have some specific criteria, made-up terms or not.
Anyway, that's my answer. If you think the cut-off point is language then it's fine. I personally do think there is some specifics to the kpop industry that you don't find in western pop, for example, and that's my personal criteria.
I am not saying American pop is the standard of pop and that K-pop falls underneath that umbrella.
What I am saying is that in each of their respective countries, their music is considered pop (popular).
In the history of pop, they borrow hip hop elements, rock elements, and even classical elements, and make it mainstream.
That's the true definition of pop (popular) music. Doesn't matter if it's kpop, jpop, cpop, or american pop.
It's popular music that borrows from all genres.
But to answer the question to this thread, no Rose's album is not kpop. It's pop. It's.....wait for it.....WORLD pop.