The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
people who had had truncovagotomy which is where they cut the vagus nerve at the trunk for severe gastritis they have a much lower incidence of Parkinson's disease relative to people who have had super selective vagotomy which means they only cut certain small branches of the vagus nerve
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if you cut the vagus nerve if you do a truncal vagotomy those people have a much lower incidence of parkinson's disease in the danish population
Removing the nerve connecting the gut to the brain decreased Parkinson's risk by 40%.