Read what the head of Bluepoint said before announcing they were working on God of War Ragnarok, "the next step in the evolution for them after making remasters and remakes" (to support in an original game):
https://www.ign.com/articles/sony-acquires-bluepoint-next-game-playstation-exclusive
Also, during this period the studio had 70-77 people, and the ones who are devs were credited in GoW. Many of them mention in linkedin that worked on GoWR since early 2021 to late 2022. You have examples in other posts above.
In linkedIn they have all their workers except one, so the game where they have been working on since they shipped GoWR will be also in a support role because their design team only has two game designers and a single level designer, not enough to lead a AAA title.