James Gunn's Superman: Legacy has already broken the DC Universe timeline before the movie premieres. Gunn and Peter Safran are in charge of DC Studios, with the duo actively planning the next ten years of their new DC Universe, which spans movies, series, animation, and video games. Besides being DC's new creative chief, Gunn is both writing and directing Superman: Legacy, the reboot movie of the Man of Steel starring David Corenswet as Superman and Rachel Brosnahan as Lois Lane, with the movie set to be the first film of the new DC Universe.
https://screenrant.com/superman-legacy-timeline-mistake-nathan-fillion/