We're talking about a PS2 game that would only have been impressive on a technical level if it had been released on the PSOne. Big surprise that the PSP could handle it.
There's no way it could run something like FFX without some major compromises in terms of technology and probably a nice re-write of a lot of code.
Edit: Huh, so the forum turns PS X without the space into PSOne. Interesting. That kind of irks me since I hate the name PSOne.