I simply don't know how it works. I'm afraid it will replace all the text across all of the game including manually translated sections, not just in a few select untranslated places.
Another factor is I use it for all the games with the same problem, so it's a hassle, but not a critical one. If the official tool was not harming the original content, I'd like to try it out, but otherwise it's better to use TExtractor.