Incorrect, FairFight is their in-house solution and this is the only tool that they use client-side for Battlefield V[1]. They've dropped the third-party PunkBuster anticheat tool since Battlefield 1.
Other EA games use other anticheat tools for example Apex Legends uses Easy Anti-Cheat[2], which is much more efficient to track and ban cheaters.
> And TBH you're complaining about 380 people which is a drop in a bucket compare to the number of players on that game
The Firestorm mode has so few players now (I estimate 3-10 games running in parallel in the world depending on the time) that it has a huge negative impact on the game. You only need 1 cheater in a game to ruin it for everyone else.
[1] https://www.ea.com/games/battlefield/battlefield-5/news/anti...