Hello,
Could you please explain the following a little more?
"Yes, I've staff on multiple different games such as fivem and also own a fivem server myself as well as a discord server for over 1500+ members. I know what it is like to be staff and what the position with holds."
I could be wrong, but I don't believe the rule prohibiting being staff in another community is specific to Gmod. Again, I could be wrong, so I'll let SMT address that.
Aside from that, I'm unfortunately gonna have to give a -support for the above reasons, specifically that I don't believe that I've ever seen you in game.