Until you can show me a REST constraint that it is violating, rather than vague assertions like "an API designed for the singular application", I'm not going to grant you that the technology isn't RESTful. Any web app can have "an API designed for that singular application." I can link out to other sites, but it doesn't have to, and the fact that it does or doesn't isn't material to whether or not it is ReSTful. If it has identification of resources, manipulation of resources, self-descriptive messages and uses Hypermedia As The Engine of Application State, it's RESTful.
Here you go:
https://en.wikipedia.org/wiki/Representational_state_transfe...
Pretty simple, just show me the constraint violated by hyperview and I'll agree with you. I don't know if HyperView provides Code On Demand, but that's an optional constraint of REST, if I understand correctly.