He ain’t wrong
He ain't right.
This has been kicked back to the trial court judge (Chutkan) to adjudicate which Trump acts fall under official conduct (immunity) vs unofficial conduct (non-immune) in the indictment. And this is key: this immunity question has to be resolved by the judge BEFORE the trial.
It is an exceptionally complex demand, and the Supreme Court has ordered the trial court to be evidence-heavy in analyzing the legality and categorization of every instance of conduct at issue.
All of the judge's rulings on immunity questions are appealable, first to the DC Circuit and then to the Supremes.
And that's before it ever gets to a jury.
Trump will likely have finished much of his second term before this is resolved.