IMO it makes little sense to make up a story about a speech impediment while holding the second highest office in the nation. https://www.cbsnews.com/news/joe-biden-writes-essay-about-his-speech-impediment/ Or he could have planned his future dementia so well that he convinced the American Institute for Stuttering that he stutters a full 12 years ago in an attempt to secure his future presidential bid. https://stutteringtreatment.org/yes-joe-biden-is-a-person-who-stutters/