If you guys read the article you would understand that the Jurassic park scene is still based on fact. The "brontosaurus" didn't "exist" in terms of it was already a discovered and named dinosaur. A paleontologist found a more complete fossil skeleton which was larger than the original skeleton of the apatosaurus which was found by an alternate paleontologist.
Brontosaurus is just another (far cooler) name for an apatosaurus. They're still big as fuck dinosaurs that very much existed. Your childhood dreams can live another day people.