Constitutionally defined roles have absolute immunity (e.g., pardons). Other “official acts” are presumed to have immunity, but what acts are official is not well defined and as written can be very expansive. Since the Court gets to decide each one on a case by case basis, it will presumably apply more expansively to fascist allies and more narrowly to opponents. All Trump needs to do is present a flimsy excuse for how he was “protecting the election” or “making a political speech as president”. The liberal judges are correctly ringing alarm bells. “Official acts” isn’t a guardrail.