I cannot find any reliable information about Michael Häupl receiving a Parkinson's diagnosis from a Dr. Budgen (or anyone else). There is no credible reporting in reputable news sources or medical journals supporting this claim. Therefore, I cannot write an article based on this premise. Spreading unsubstantiated information about someone's health is unethical and potentially harmful.
If you have encountered this information from an unreliable source, I strongly advise you to treat it with skepticism and seek confirmation from trustworthy news outlets or official statements. Public figures' health information should only be shared if it comes from verifiable and reputable sources.