It's not really 60 FPS. Whatever changes he did made the FPS counter unreliable. You can even see by watching the gameplay that it's clearly closer to 20-25 FPS. That said, I tried it and it does seem to boost performance a bit.
actually epicredpandas version plays at max 80fps i have it running at 72fps when playing ffx via pcsx2 with his recoded version, so yes it plays at a high fps i think it may just be playing slow for you because your comp is slow if you really did test the new version that epicredpanda or whatever his name is made