2023 what?
It better be ps5 exclusive if that's the case
Cross gen in 2023 lol
Buy a next gen console in 2020 to play next gen games in 2022.
As I remember their competitor said all their own games were going to be crossgen during the first couple of years, so it wouldn't be too rare.
Sony announced (and released some of them) several next gen only games for the first year, but Ryan mentioned in the 'we believe in generations' interview that they will continue supporting PS4 for during at least 2 or 3 years after the PS5 release, as they did with all their previous consoles. The main reason being that PS4 still has over 100M active users and that in the first couple of years only a small portion of that (maybe 20M?) will upgrade to PS5.
Big AAA publishers also have crossgen (or previous gen) games planned for 2022 or beyond. Some of them announced, some of them don't. Now I remember the leaked date for Street Fighter VI, late 2022 (which considering that always there are delays and now even more with covid, it's fair to expect it for early 2023).
But regarding God of War Ragnarok, we don't know if it's going to be crossgen or not. All we know it's planned to be released on 2021, that his release date is on place with the development time of their previous games, and that anyone saying it will be delayed it's making just a personal guess.
Considering the common covid related delays and the fact they are supply constrained and seems they will continue to be for several months, it's fair to think it may be delayed to 2022. But to think it will be delayed to 2023 doesn't make sense at all considering previous GoW development times.