If you used keys from 2020, newer games simply wouldn't boot.
As of recent updates (Firmware 17.0+), the keys from 2021 are outdated for current games but remain technically accurate for archiving and playing software released specifically in 2021. If the file was generated correctly in 2021 (via tools like Lockpick_RCM ), it is a "correct" set for that time period. sak are the keysdat prodkeys correct 2021