PS5 pre-load screen confirms Warzone 2 is NOT a separate application, but directly integrated into Modern Warfare II much like Modern Warfare 2019/ Warzone before it. : r/CODWarzone
Warzone 2 Season 4 Update Size For PC, PS4, PS5 & Xbox - COD Warzone Tracker
Good luck figuring out how to download Warzone 2.0 | Eurogamer.net