I just searched it, straight from playstations website:
https://direct.playstation.com/en-us/buy-games/god-of-war-ragnarok-pc
“Do I need a PSN account to play PlayStation games on PC?”
“No, you currently do not need a PSN account to enjoy PlayStation Studio games on PC, but you will need a Steam account to redeem your voucher code. Some of our PlayStation Studios titles also offer incentives for linking your Steam and PSN accounts.”
Edit: Their website could be outdated, or incorrect? I just swear I saw an article title that Sony removed the requirement for PSN for Ragnarok PC.
Apparently The VVitch is extremely impressive and accurate for the English dialect they speak in the movie. They pulled old court records related to Salem witch trials. Things like that give me hope for Nosferatu!