No, it did not. It said the Dreadnought was originally PLANNED to appear in the vanilla story. The same story where Rasputin was a grumpy Exo that we would rescue from the Hive (who kidnapped him and took him to the Dreadnought), and a character named Crow was the character model that became the Queen's brother. "Planned to appear" is not the same as "fully programmed and realized". Bungie basically re-wrote most of the game in about a year, according to the article. Read it again.