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DmC Devil May Cry is explicitly a different universe to the original timeline, the same way as Castlevania Lords of Shadow series is different to the traditional Castlevania timeline. Calling DmC "DMC5" was wrong, hence why fans have been asking for DMC5 for years now, it's never been touted as a sequel, only a reboot.
While God of War is a reimagining of the game systems and gameplay, it's canonically the next part of Kratos' story. Calling it GoW4 isn't really wrong, and also helps people differentiate it from the original PS2 game.