That's the insidious part. People advocating for Biden to go on a crime spree are assuming that the Supreme Court is aiming to be consistent, and apply this ruling fairly to both parties. They've INTENTIONALLY left it unspecified what counts as an "official" act, so that any question that comes up just goes right back to them, and they can rule however they see fit. Also, people are assuming the Court won't just directly contradict their own rulings, the moment it's convenient. This entire thing just shows that the Court can and will give itself final say on any questions of law or policy, I.E. anything anyone in the government does. This doesn't make the President a king, it makes the Court the king.