What does the speaker mean when he says "I don’t think I need to tell you why the Winchester family is famous"?

Today we’re gonna take a look at an unusual house in America, the Winchester House. (14) It was built by Sarah Winchester, the nineteenth-century heiress of the Winchester family. I don’t think I need to tell you why the Winchester family is famous. That’s right. It’s the owner of the Winchester Repeating Arms Company, which made its wealth by manufacturing Winchester guns, the gun of note and notoriety in the American West.
     Sarah Winchester was married to the son of Oliver Winchester, who’d founded the Winchester Repeating Arms Company and made a huge success of it. In 1881, Sarah’s husband and their month-old daughter died. Sarah was destroyed by the loss of her beloved husband and daughter.
     (16) In the aftermath of her loss, Sarah was convinced that the family’s misfortune was due to the fact that the family’s massive fortune had been obtained through the manufacture of weapons responsible for uncountable deaths. Sarah became convinced that the family was being haunted by the ghosts. (15) To thwart the ghosts, she plans to build such a confusing house that the ghosts wouldn’t be able to find their way through it. This is the story of how the Winchester House came to be the way it is. (17) Whether or not you believe in ghosts yourself, and…well…not everyone does…you can see that Sarah did. The world of architecture has one huge and eye-catching reminder of Sarah’s belief in ghosts.