Loki told his side of the first Avengers movie for the first time, including why he attacked New York with Thanos's alien army. His version of events isn't exactly new information. Rather, viewers learn he sees his Marvel Cinematic Universe past with clarity. After all, this version of Loki didn't get to make amends with his brother and father before heroically giving his life to the people of Asgard.
Source：https://www.cbr.com/loki-season-2-avengers-movie/
