There have been a couple of changes to the rules regarding the Definitive Edition and 10 Year Anniversary versions:

Definitive / 10 Year Anniversary

• Individual Levels (ILs) previously using IGT are now timed using RTA.

Taken from GTA III: (https://www.speedrun.com/gtaiii/news/jxn91k6k):

Moving forward, the following missions will be timed using RTA convention: Patriot Playground, Multistorey Mayhem, A Ride in the Park, Gripped! and Rigged to Blow (Bomb Defusal). This change has been made due to IGT inaccuracies and potential for abuse. Be sure to read the rules for each individual level to know when the timing starts and ends. Please note that you are not required to show the stats screen upon completion.

These same changes have now been applied to the remasters. All affected runs have already been retimed.

10 Year Anniversary

• Removed the "The Frame Limiter has to be set to - On" rule.

Please note that external frame limiting remains strictly forbidden.