Does the plugin no longer show these? 
Just installed this and a BetterChat on an offline server to test some things and didn't notice FauxAdmin showing either the Dev or Admin tag.
Awesome if it's the case :)

correct, it doesnt show it anymore. 

Ah does actually appear to still show, i just hadn't relogged. For FA to apply it fully.
edit: BetterChat seem's to be the one doing it. I did have a botched fix of this, any idea if we could see something offical?

I have a server and i just installed faux admin. my mod has the [Rust Developer] tag? how do i remove it?

AlecF24

I have a server and i just installed faux admin. my mod has the [Rust Developer] tag? how do i remove it?

Disable it in Faux Admin.

You can switch it to the admin flag in the config. 
I dont think there is a workaround i can do as better chat still looks to see if player has those flags. I dont think that plugin has a api call . But ill double check.