Blue Beetle will feature references to Zack Snyder's Man of Steel, and the movie's director explains the choice. Snyder's Man of Steel started the DCEU back in 2013, with Henry Cavill's Superman being the shared universe's first hero. While the Blue Beetle movie is not part of James Gunn and Peter Safran's new DC Universe, Xolo Maridueña's Jaime Reyes is the new DC Universe's first movie character. That parallel between Blue Beetle and Man of Steel is not the only connection between the two movies.
https://screenrant.com/blue-beetle-man-of-steel-references-snyder/