So then I gather from "it seems that AMD wants to hammer home the point that Raven Ridge is composed of Zen CPU cores and Radeon Vega graphics." that it is by every definition an "APU" ! So if I call a Duck an Eagle is it then an Eagle or a Duck?
An APU is simply a processor that combines CPU and GPU elements into a single architecture. The first APU products being shipped by AMD and Intel do this without much fuss by adding graphics processing cores into the processor architecture and letting them share a cache with the CPU. While both AMD and Intel are using their own GPU architectures in their new processors, the basic concepts and reasons behind the decision to bring a GPU into the architecture remain the same.
The future is fusion?