alt Hacker NewsYou need to get the game in the first place, which requires a console that’s authorized to download games from PSN.
I don’t know how Sonys attestation works, and how resistant it is; but presumably it’s a bit harder than “lie to the game about what firmware you’re running”.
(GTA VI will famously not have a physical release, so you can’t rip data off the disk.)
A trivial scheme would be to distribute some shared secret key in a new update, and require it to be supplied back on connections to Sony's servers. In order to extract that key in order to replay it from an older firmware, you'd need to have root on the new firmware.