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.
Happened as dated, per the source: "the official opening of the Lakhta Center multifunctional complex took place on December 5, 2019."
Wikipedia's article on Lakhta Center does not state an explicit opening date, only that construction was completed in 2019 and the tower topped out in January 2018 - broadly consistent with, but not a direct confirmation of, the pin's stored December 5, 2019 opening date.
Archinect's own headline states the tower was 'now officially commissioned,' published December 6, 2019 - one day after the pin's stored December 5, 2019 opening date, consistent with a same-week commissioning report.
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.