The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
SOM's own project announcement states the Moynihan Train Hall "opens January 1" (2021), corroborated by New York YIMBY's coverage of the public opening that day.
Wikipedia and SOM's project page both independently confirm the Moynihan Train Hall opened to the public on 1 January 2021.
Something missing or wrong? Say it in your own words: a link that backs this pin up, a different start or end date and why, or a fact it lacks or gets wrong. The AI checks it against this pin's sources, searches for better ones, and adds any page that backs you up. The pin's own sources still count most.