@feld I'm deeply sorry about your father and I'm sorry if my summary line was insensitive. I will own that.
My reasoning came from this quote (also in the abstract), which was further down in the post you pulled my summary line from: “We can infer that SARS-CoV-2 promotes the aggregation of α-Syn and, ultimately, leads to Parkinson’s disease through at least two mechanisms.”
I have studies on covid and Parkinson's using data going back to 2020, if you're interested I'm happy to share links.