Since we only have the name 'Dewey Cox' from the 'dewey cox real life story' title, it's difficult to determine precisely who he is. He could be a fictionalized version of a real person, where the story takes some creative liberties to tell his tale. Maybe he was a pioneer in a certain industry, or just an individual with an interesting life full of anecdotes, but without more context, it's all speculation.
Definitely not a true story. It's a fictional tale crafted to entertain audiences with its unique plot and characters. Don't expect any real-life basis for it.