The mod doesn't work and the page is still messy. I opened up a new topic at the forums, so far one user says it isn't too bad even without the frame limiter.
As far as I know (and tested), the only issues with playing at locked 60 are weightless cars that you can push with your body, fast pedestrian speech, hard-to-turn-off sirens and fast takeoff helicopters. These problems mostly concern speedrunners of all people, they always try to get as close as possible to vanilla due to very strict rules.
In any case I would add those few glitches as negatives if you wanted 60fps. I can give you video evidence of the fix working as intended (it objectively does) if you are too lazy to check:
streamable. com/u2p4x (remove the space)
The car should never fuse with Tommy after the intro if the limit is properly set.