First, its not cheating, because the KF devs arent against it. I just use it to fight a lot of monsters by myself. Cheating its two clicks and every perk on level 6.
Second, he could make his own server and level up on begginner by himself.
Hey did you know that the leveling up on solo was disabled to stop playrs from leveling up in solo ?
So yeah they are against it, there's just nothing they can do about it.