It's using our unmodified source code (not sure why it would be using an older version though) with its own ui.
Well, i'm not gonna recommend using this for 2 reasons :
- we don't maintain that port so we can't help you if you encounter any issue with it
- over the years i have seen a few bug reports ending up on our discord for this pfba/pfbneo project, and when i tried to reach out its author about them, he told me he doesn't have time to provide support
Imho, you are better using our libretro port (it's supposedly available on ps4) since we can help you with that one.