Veteran COD2 players know the "X-Ray" tell. If you trace an enemy perfectly through a concrete wall while running, you look suspicious. With your new "better" hack, practice looking slightly off target. Look at the wall next to the enemy, then flick onto them. This is called "legit cheating."
If wallhacks provide the vision, aimbots provide the execution. In the v1.3 environment, these scripts have become incredibly sophisticated to avoid detection. wallhack and aimbot for cod2 v13 better