WOW! Far as I know Trump has moved his residency to Florida from New York. He's a snowbird so it's no biggie most of 'em do it eventually.

Trump has used the absentee voting system in at least three elections: Trump voted by mail during New York’s mayoral election in 2017, cast an absentee ballot during the state’s midterm election the following year, and again used a vote-by-mail ballot in Florida’s primary election in 2020. (Snopes)

But I'm not sure I buy the bit about voting in Florida's primary...
Did we have a Republican primary? He can't vote in the Democratic one and the one for candidates other than president isn't until August.
Good coffee, good weed, and time on my hands...