I get your point, but just because you and your freedom are immune to prosecution doesn’t mean your money and property are safe from seizure. For example, if it’s believed that Mar-a-Lago was used in the process of a crime, like withholding documents or discussing illegal things, then it can be seized in civil asset forfeiture and Trump would have to prove his innocence to get it back. Same with his money. I think it’s possible in the current context to find a judge willing to try this. I have no idea how the execution of such an order would play out. But there are still interesting cards unplayed.
The key is that they’re part of the corruption and are therefore malleable. Their actual stances don’t matter once they fall in line because their opinions are now given to them.