Duplicates are handled by community and normal users in a process which currently is slow and painful, for a couple of reasons.
Yes, we need a kind of a bat signal to finally remove duplicate kata, because neither me, nor you, nor any other normal user can remove approved kata.
Any user can help, the #fixing channel on Codewars Discord is a very active place where users discuss ways how to fix various issues in kata, including duplicates.

And to be clear: duplicates of Caesar Cipher kata are not being added anymore. The most recent one on the list of dupes is from Dec 2016.

This kata has already been reported as a duplicate, together with six others. It;s waiting in its line for deduplication, but there's no schedule for handling them.

yeah, this is like the fifth one i've did, and just reused my code for most of them

why tho? i thought this one was pretty straight forward. whats your question?