it turns out it was a skill issue on my end

Author: ghzdude

src/main/java/gregtech/mixins/mui2/LangKeyMixin.java

@@ -16,6 +16,6 @@ public abstract class LangKeyMixin extends BaseKey {
               at = @At(value = "INVOKE",
                        target = "Lnet/minecraft/client/resources/I18n;format(Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String;"))
     public String getTranslateKey(String translateKey, Object[] parameters) {
-        return LocaleAccessor.getRawKey(translateKey);
+        return LocaleAccessor.getRawKey(translateKey).replace("\\n", "\n");
     }
 }

src/main/java/gregtech/mixins/mui2/TextCompilerMixin.java

@@ -7,9 +7,7 @@
   "injectors": {
     "maxShiftBy": 10
   },
-  "mixins": [
-    "TextCompilerMixin"
-  ],
+  "mixins": [],
   "client": [
     "LangKeyMixin"
   ],