When he uses his official powers in any way, under the majority’s reasoning, he now will be insulated from criminal prosecution. Orders the Navy’s Seal Team 6 to assassinate a political rival? Immune. Organizes a military coup to hold onto power? Immune. Takes a bribe in exchange for a pardon? Immune. Immune, immune, immune.
Her dissent starts on page 68 of that document, with Jackson's after. It reads faster than you would think with the giant margins, would encourage everyone to take a look if you have a moment.