Sure. The Flux-derived frameworks (such as Reflux) don't actually care about what your backend is -- they only deal with the internal data flow of your app. I haven't used Reflux, but I am pretty sure you have to implement the backend calls (AJAX or whatever) yourself.
That's not much -- and all the projects are probably toy projects, to fit all of them in a week's span.
>while it's nice, it is what it is- a view layer.
Sure, that's why you use Reflux, Redut and some other Flux architecture helper to frame your code, ReactRouter, etc.