It is, the one that's being used right now is a modification of the launcher in the repo.
Edit: Some code modifcation is required to make it connect to the new server listing:
In configuration.rs change:
.set("ServerListUrl", "https://serverlist.ren-x.com/servers.jsp")
to:
.set("ServerListUrl", "https://serverlist-rx.totemarts.services/servers.jsp")
You probably need to change the VersionUrl but I don't know what it needs to be changed too.