No they haven't.

Every single mental health specialist who's been asked to review Trump's speeches and interviews has agreed that he seems to be exhibiting signs generally suggestive of dementia and general cognitive decline. E.g.:

[Experts say Trump’s speaking style shows ‘potential indications of cognitive decline’](https://www.independent.co.uk/news/world/americas/us-politics/donald-trump-cognitive-decline-election-2024-b2593296.html)

[Donald Trump Dementia Evidence 'Overwhelming,' Says Top Psychiatrist](https://www.newsweek.com/donald-trump-dementia-evidence-overwhelming-top-psychiatrist-1881247)

[Mental health experts sound the alarm on Trump’s potential ‘cognitive decline’ as he’s ‘lost touch with reality"](https://www.independent.co.uk/news/world/americas/us-politics/trump-mental-health-fears-cognitive-decline-b2625124.html)

[Cognitive Decline? Experts Find Evidence Trump’s Mind Is Slowing](https://newrepublic.com/post/184690/cognitive-decline-experts-find-evidence-trumps-mind-slowing)

>New research found several compelling pieces of evidence that suggest that Trump is significantly less sharp than he was at the start of his presidency. \[...\] Comparing his speeches from this year to those from 2017, researchers discovered that Trump uses shorter sentences, confuses his word order more often, repeats words and topics, and frequently goes on tangents.

>“I can’t tell you how staggering this is,” \[social psychologist James\] Pennebaker told STAT. “He does not think in a complex way at all.”