Plutonium

They changed how user stats where saved a while back. Its been a while but I think the thing you are referring to only works on LAN now. I think that if you reset your stats on LAN or just play a LAN game the user folder should reappear. I didn't look too far but it looks like the are new ways to do this same thing which you can find here: https://forum.plutonium.pw/topic/56/release-shotgun-rank-max-bank-all-perma-perks/119