Backwards Compat PS3s are definitely allowed. I'm actually interested on how loads compare to PS2 personally, I look forward to seeing your runs.

Backwards Compatible "Fat" PS3s are currently allowed (the 20, 60 and 80GB models) however Jailbroken PS3s that can play PS2 Isos are not allowed. We look forward to seeing how the game runs and loads if you do attempt runs!! :3