Ratings are mostly silly. I remember 20 years ago Yale law advised people to not put any credence in the us news rankings. They were the top ranked law school that year.
I thought that was funny but I get it more now. BYU has a ridiculously high level of academic performers at BYU and their ranking drops because most of the available pool or applicants is homogenous. And despite the international growth of the church those kids won’t come to Provo so it likely won’t change dramatically any time soon.