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That's a good diet but maybe not protect you from Parkinson's if it really starts in the gut and is caused by e.g a virus

Everything they mentioned will benefit gut health and the immune system's ability to fight viruses.

Not true, eating more fiber can cause a bacterial overgrowth. If a particular bacteria causes PD then this would actually raise your risk of PD.

Yes, health and medicine is actually more complex than "don't eat McDonalds!"

The immune system already fight pretty well against Epstein-Barr viruses but still the infection is a a reason for developing Multiple Sclerosis.

Depending on where you live, that comes with an assortment of chemicals, and a dearth of nutriments.

What should you eat instead in those places?

This does nothing if the cause ends up being a bacteria, for example.

This advice is good. The broader idea that eating "healthy" solves everything is delusional.