Does Joe Biden have Parkinson's dementia?

Alex Berenson claims that one anonymous neurosurgeon thinks he does:

“A neurosurgeon diagnoses Joe Biden

Mid-stage Parkinson’s, with dementia”

https://alexberenson.substack.com/p/a-neurosurgeon-diagnoses-joe-biden

“[Biden] undoubtedly has Parkinson’s disease,

and is increasingly suffering from Parkinson’s dementia.

The signs are unmistakable

…

Here we have someone with cognitive issues with his hand on the nuclear button.”

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See also:

https://youtu.be/fJ1P7gGfUUA

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How could Joe Biden put this question behind him?

Hold a 90-minute press conference, allowing questions of which he does not have advance knowledge.

No teleprompters.

No speechwriters.

Just Joe and the reporters.

Let's see how he deals with the questions.