>

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.
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.