Up until that time, there were no credible sources or historical records suggesting that Walt Disney had ADHD (Attention Deficit Hyperactivity Disorder). Walt Disney was an American entrepreneur, animator, and film producer, best known for creating iconic characters like Mickey Mouse and founding the Disney entertainment empire.
ADHD is a medical condition that can only be diagnosed by qualified healthcare professionals based on an individual's behavioral patterns, medical history, and other factors. Diagnosing historical figures retroactively can be challenging, as it relies on historical accounts, anecdotes, and other sources, which may not be sufficient to make an accurate assessment.
If there have been any new developments or research about Walt Disney's medical history or ADHD , I wouldn't be aware of them.