Directly from Sony. It may be required for certain modes or features. Not for the entire game to function. Even the EULA that you agree to for the game says nothing about requiring a PSN account.
I still don’t know why you’re so determined to back Sony on their bullshit that is anti-consumer, and is actively harming the gaming community.
Is the entire game a mode or feature? If it’s not then you can fuck off with that argument that it doesn’t say you don’t need it. If you’re a Sony PR person you’re bad at it. And if you’re not, then you have a weird obsession with siding with shitty corporate behavior.