This article tells something true, but as usual, it is much more complicated than that. The anecdote about MPTP is true, but it is not the only way to induce Parkinson's disease, for example, animal models are often created with 6-OHDA
https://en.wikipedia.org/wiki/Animal_models_of_Parkinson%27s...
The Politico article cites rotenone only one time, yet it is commonly used to induce Parkinson's disease.
https://pubmed.ncbi.nlm.nih.gov/40203643/
My guess as a layman in medicine is that if you mess enough with the body's function it retaliates with severe diseases like cancers, Parkinson or ALS (try eating false morels!).
The problem is in my view ecological, we are poisoning our environment.