What is the rationale behind creating a ‘pretotype’ rather than a more simplified version of a prototype?

Do we really need to make design more complicated than it really is (or should be)? I have heard that the term 'pretotype' is being thrown around a little bit as the next trend in UX research and testing, and I have been trying to find information about the difference between doing a even more rapid/lean version of a prototype that becomes something of a different process in itself?

Are we really splitting hairs here or should we be just classifying the different types of prototypes that we can create, whether it be something that is interactive vs. non-interactive, high vs. low fidelity, functional vs. conceptual, etc.

I would be interested in hearing thoughts about the use of this word in the design circles, or what the term means to other UX practitioners out there.