Discovery did state on page two of the article that what was found of the snake, named Titanoboa cerrejonensis, was in fact fossils. Titanoboa cerrejonensis was 42 to 45 feet long and dates back 58 to 60 million years. The article then explains that this breaks the previous record by eleven feet of a creature that lived about forty million years ago. In contrast to your source, Discovery News claims the largest living snake ever found was thirty feet long. So, there would have to be a living snake found that is one-third greater in length than the one already discovered to make forty feet. Seems far fetched to me, but believe what you wish. I believe in Sasquatch far greater than I believe in a living forty foot snake, which I'm well aware could start a whole new discussion.
Don't worry, I'm not riled, just enjoy a good heated discussion.