I can see Miami Dade flipping but who are the voters that would even make that happen? Aren't Republicans maxed out with Cubans there or do they still have room to go with them and Puerto Ricans etc??
I think it's more likely Biden narrowly wins Miami-Dade than Trump does. There would probably need to be some sort of huge turnout differential between post-pandemic transplants and "locals", as well as post-2010 non-Cuban Latin American immigrants being anomalously R like post-2010 Cuban immigrants are.