PSP has finally been separated from Emulator. There is a new category called PSN for submissions of any digital version of the game: PSP, PSTV, PSVita, PS3 (through PSN download), PS4, PS5. If you play the game with the physical disc on PS1, PS2, or PS3, submit to the PlayStation category.
The rules have also been freshened up a bit to be presented and organized better. Some clarifications have also been made such as explicitly specifying that on all platforms we time by IGT.