Anyone who thinks Sony Santa Monica (a huge dev) is putting out god of war in 2021 (3 year turnaround), with one year in quarantine at home, they're absolutely insane. I have no earthly idea why they said 2021.
They said 2021 because they plan to release it in 2021. That's it.
Sony has been really cautious about giving out release windows in the last 2 years unless they are confident of hitting the target.
Obviously delays can happen, but the last delays were only a few month.