As by an official announcement or trustworthy reports. The question can resolve anytime until 2030, as long as the source credibly mentions that the neurological disease already was present in the years 2020 - 2024 (including 2024). Early-stage disease and pre-cursors count, such as early-stage Alzheimer's.

Resolves no by the end of 2030 if there's no strong evidence in favor of yes by then.