is this allowed by community guidelines? "not altering the gameplay"

same question, i guess u dont change any gameplay mechanics with this?

It would alter the game visually, as this functionality isn't possible via Rust natively; so I would generally say no.  You can find more info and disucssion on it here though: [HOW TO] Modded in Community Section / Guidelines / Plugins / Good to know : playrustadmin (reddit.com)

but we are allowed better chat, and colored nicknames, this alters the game visually.

https://support.facepunchstudios.com/hc/en-us/articles/360009062817?input_string=community+server+rules

their rules are very 'grey' imo, you can always contact them directly, and post here what they say. Official servers are allowed to use plugins they tell us not to so you can't even go off that.