Haleivi, writersoul: I think it’s the same answer to you both and that is what I’ve kept saying I understood from my Rosh Kollel. The Rambam’s recanting his position does not invalidate his original shitah. Meaning the Yad the Moreh etc are all still Torah to be learned and likewise to be cholek on by those who are capable of that. That is why there is no problem that Rishonim and Achronim still discuss and argue on it.
I can also suggest an answer to your question about the Raavad. Shivim panim L’Torah. There are many minhagim on how to do mitzvos al pi sod that we got through the Arizal. For instance I believe the Arizal is the source of the double hole for tzitzis. That doesn’t mean that there is no sod in using only a single hole, just that it wasn’t part of the Arizal’s Torah, so we don’t know it. Likewise I would say that if the Raavad didn’t see something al pi sod in something the Rambam wrote its because it wasn’t part of his Torah. But I’m sure Moshe Rabeinu could have explained it to him.