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As a Floridian who has watched DeSantis's career evolve, in some ways I think you give him too much credit. He is not smart enough to make plans, just smart enough to spout off what he knows people want to hear. I don't think he even realizes what he does or doesn't have the power to do. What is scary about him is that he has gotten bolder and more willing to just spew whatever his base, party, or financial backers want him to. A Desantis presidency would be like an even crazier Andrew Jackson/Donald Trump hybrid in all of the worst ways.
Republicans in the state legislature are passing all kinds of stuff for laws that DeSantis violated. "Oh, this group he created isn't legally allowed to bring charges against people?" He's a new bill saying they can!", "Oh, DeSantis broke the law using funds to fly migrants from another state to ANOTHER state just for a political stunt? Oops here's a bill saying he can!"
"Oh, DeSantis needs authority to carry out his vendetta against Mickey Mouse? Oh here's a bill for that!" >

You are correct >

And it’s retroactive. Trump would have loved that remedy >

How are retroactive laws legal? If a politician violates a law, they shouldn't be able to pass a new law that says their past activity was actually legal. I thought all laws need to be effective when they are passed. (Or at some time in the future.)
Of course, what are you going to do? Sue DeSantis in the state courts in front of the judges that DeSantis appointed? They'll likely say that the governor can do anything he wants. Unless a Democrat somehow is elected, of course. Then, governor is a position with very limited power. >

See, this is why I'm worried about DeSantis.  He's spent months pulling stunts that have no basis in law to rile the MAGA base up with culture war bullshit...  And now he's going back and making it real and legal after the fact.  He's figured out that when you can write the laws, nothing is illegal. 
Now picture him as president.   He's way more dangerous because he'll be just as evil, but actually have the ability to form thoughts and make plans.