Then the hacker will just stay on the server because unfortunately I couldn't get it. However:
People I recently played with on Garry's Mod:
Only one guy called Saumonelle
His Steam profile (Also shows the VAC Ban) which has same profile picture as guy above
Only screenshots I took
This is proof that there is only one Saumonelle on this server
Thats all the proof I can give you, if you can check a players logs just use the steamid and you will see he is called Saumonelle, now the fact that only one guy named Saumonelle ever played on this server it should be clear
I'm just trying my best to keep the hackers off from ruining the fun