Fujifilm teases upcoming SLR-style X system camera

Why is an SLR-styled camera without a mirror fake, whereas a rangefinder-styled camera without a rangefinder mechanism, is not?

Even though the design of SLRs were dictated by the technology inside them, the design in and of itself is still valid, even without a mirror, to someone who likes how these cameras handle. The same goes for rangefinder-styled cameras, if you like how those cameras handle.

Source Article from http://www.dpreview.com/news/2014/01/20/fujifilm-teases-upcoming-slr-style-x-system-camera