It seems to me any defense of Mulavidya vada would have to account for Hacker's exhaustive study. Sengaku Mayeda performed the same analysis on Upadesa Sahasri and came to similar conclusions https://docs.google.com/document/d/1nE0s2sFIqc0fYdgto0rGlW16xx6lsNEDJKsWVr6CJPw/edit?usp=sharing