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According to the Doom Slayer article on doom.wikia the current timeline is Doom, Doom 2/Final, Doom 64, Doom (2016) and Doom Eternal.
So why not just call it Doom 2: Eternal
Hell they could have related it to the original sequels name, Hell on Earth by calling it something like Hell Roams Earth or Demons on Earth while using the retro poster but updated like they did for Doom 2016
Cuz there’s already a game called Doom II
It was simply the developers choice.