Most modern online games use "favor the shooter" netcode. If you see an enemy on your screen, you hit them. Fake lag exploits this by creating a disconnect between where the cheater actually is and where the server (and other players) thinks they are.
If you want to win more matches, spend that energy watching pro tutorials, adjusting your mouse sensitivity, or (ironically) fixing your actual lag by switching to Ethernet. Fake Lag Script
This comprehensive guide explores everything you need to know about fake lag scripts, from their technical inner workings to their controversial role in modern gaming. Most modern online games use "favor the shooter" netcode