Everyone says what you are saying - so I’m not here to dispute it. And maybe something has changed in the last two years.
But UF deems what you say - about # of students at HS and OOS chances - as false. See #1 and #3 in their FAQs.
I believe their lack of geographic diversity has more to do with - if you’re a smart kid in Florida, the Bright Futures or Florida Pre-Pay is so strong - you can’t leave the state (that’s exaggerated). We have friends in TN who started in FL with pre-pay and even their kids went back.