Zippy6 on 21 January 2024
Aren't all those PS2 on PS4 titles like Dark Cloud etc using emulation? So they already have a PS2 emulator that works on PS5 they just haven't released nearly enough games that use it.
With a jailbreak PS4 you can use the emulator with any PS2 iso apparently but compatibility is hit or miss.
https://www.psdevwiki.com/ps4/PS2_Classics_Emulator_Compatibility_List
Essay Pro