[Silvers]

Well for me it works as expected. I customize my grenades and disconnect. Then I set: "sm_grenade" "z" in "admin_overrides.cfg". In "admins_simple.ini I set myself to have "99:abcdefgh" permissions. I use the command "sm_reloadadmins" and rejoin. I then can no longer access "sm_grenade" and the grenades I pickup and throw have no Prototype Grenades function so my only conclusion is you have something setup wrong. Everything I have tried (and I've tested multiple times for you) works as expected to prevent me from having Prototype Grenades types when I shouldn't.

Are you using the latest version? This blocked the types when equipping the grenade.