After accounting for other potential risk factors,

I doubt Mass General Brigham is so incompetent that they don’t know how to do science. They do talk about the study limitations, especially around H. Pylori status, but also state that they collected detailed health and lifestyle history to control for confounding factors.

Nah, this could be a simple SQL statement with the right data source.

SELECT
    v.ssn,
    TRUE AS terrorist
FROM citizens v
INNER JOIN voting_history h
    ON v.ssn = h.ssn
WHERE h.party_affiliation = 'Democrat';