Question about a Shrek theory

There's a theory on YouTube saying Jack Horner, from the movie *Puss in Boots: The Last Wish*, ruined the fairytale creatures and people in the Shrek universe because he stole a lot of magic stuff from them like Excalibur from the story of King Arthur. He was shown with it in *Puss in Boots: The Last Wish*, and theory people say that's the reason Arthur in *Shrek the Third* is a wimpy, weak teenager who gets bullied a lot. What do you guys think of this? Do you guys think it's true? https://youtube.com/shorts/Db4yBzGChRY?si=PmW5DBN75sg6Z24\_