Missed half of the commit

src/main/java/carpet/CarpetExtension.java

@@ -70,12 +70,6 @@ public interface CarpetExtension
         registerCommands(dispatcher);
     }
 
-    /**
-     * @deprecated Implement {@link #extensionSettingsManager()} instead
-     */
-    @Deprecated(forRemoval = true)
-    default carpet.settings.SettingsManager customSettingsManager() {return null;}
-
     /**
      * Provide your own custom settings manager managed in the same way as base /carpet
      * command, but separated to its own command as defined in SettingsManager.