When Peter Safran and James Gunn took over the DC Universe, fans wondered how much they'd keep from the old DC Extended Universe. Well, apart from Peacemaker, Amanda Waller and Blue Beetle, it appears that everything else is being cut so the new franchise can take shape. News has emerged about more Justice League recastings occurring, which isn't a surprise as Superman: Legacy is already putting in other heroes.
Source:https://www.cbr.com/superman-legacy-use-jason-momoa-lobo/