It's been a wild ride for Digimon Survive when it comes to release date information. The latest bump in the road came last week, when Toei Animation Europe had added a January 2021 release date for the game to their website. As they're the licensor for the game, you'd think they'd have the correct info. Now it seems that wasn't the case.
The page on Toei Animation Europe's website that had the January 2021 listing has now been updated. All the page states now is that Digimon Survive is coming. There's absolutely no date listed at all, so I guess we're back to thinking this game will come out sometime this year.