What causes the sound though? Vibrations. Living next to a busy road means exposure to constant tremors, even if low level, which would certainly explains the balance aspect in my opinion.

If this is the actually connection and they know it, then yeah i suppose the headline is being clickbaity and facetious.

However, parkinsons is a brain disease, not just a disease of the nerves - with correlations demonstrated for other environmental traumas (article lists pollution for instance), it seems likely that parkinsons is just the result of a brain traumatised from the combined actions of modern life traumas, which maybe deny it a chance to grow or heal the way it is supposed to.

I guess all i can say is that the reasoning makes sense to me. Human biology is weird, biology in general is weird, and all our civil engineering systems need to be revised anyway for multitudes of reasons, so i am not object to the idea on any basis.