You want to post this under Garry's Mod discussion and help.
OT A bypass allows you to change sv_allowcslua to 1 so you can run lua scripts it does not bypass ulx or anything it only allows you to run scripts but I wouldn't suggest using a public one because they may get you banned from garry's mod due to the GAC anti-cheat just spend $5 buying a private one and a private script but these are only for aimbots and wallhacks etc.
If you need more clarification on bypasses or anything just ask someone on the forums.