I’d love to truly know the answer to this, but I don’t think anyone (on the internet) knows.
FSU fans think they are getting accepted to the AAU any day now anyway, but that it doesn’t matter anyway. And with what we all know about the networks’ influence, it may not. But it would be nice for the Big10 to definitively say one way or another if doesn’t matter, if it is something that is perhaps one of the factors that they take under consideration (which is my guess), but not an absolute requirement, or is a strict requirement for membership