You're conflating different chemicals together.
Paraquat (what this article is about), isn't used by any people in the links you gave (golf courses, Dutch or Swiss farmers).
parkinsons might have multiple causes.
https://www.wired.com/story/scientists-thought-parkinsons-wa...
parkinsons might have multiple causes.
https://www.wired.com/story/scientists-thought-parkinsons-wa...