The universal prefix for all popular admin commands is :. Most exploit admin commands ran through a script executor use the prefix ; to reduce the likelihood of admin commands picking up the command and logging it. A while back, roblox made a change that enforced the usage of the Filtering Enabled property adding more security to every game. Before, without Filtering Enabled, further on FE, exploiters could use these admin commands like they owned the game themselves. Many Exploit Admin Commands no longer work being that their commands were made for FE being Disabled.
In general, if someone uses admin commands in your game and you either have no admin in or confirm they aren’t an admin, they are almost surely an exploiter and you should take appropriate action to report then using the in-game report feature and/or handling it yourself with an in-game ban.