With Indominus Rex in the public eye right now, the SBG wanted to take a look at other dinosaurs that were never a part of nature, nor meant to be. You may THINK they're dinosaurs, but no, not quite, sorry, amend you science bibles.
BUT! After Brontosaurus was termed a valid genus (ralted to Apatosaurus) again this year (it pulled a Pluto), you never know when a fakesaurus will prove to be very real indeed. So keep an open mind! Science evolves just like the animals it studies!