Well a couple things, first the MSAR is outdated. Miami used to be IS only, but a few years ago they started to accept OOS students, though the number was CAPPED(I think 25%?). I think during my interview they told me that they have no such caps anymore. Secondly, while they don't exactly prefer IS applicants, it IS cheaper for ISers and due to other factors(proximity/familiarity, etc.) they get a higher yield in terms of matriculants vs. acceptees for IS students. So I guess in this way, they do make it easier for IS students.
Once you're at the interview stage tho, there is no difference, both get accepted at some crazy high rate(close to 80%)