They gave it absolute immunity. That means there is no way to appeal, to argue, to halt, stop, or sue any act by a president. Even arguing whether or not the act is official would be a type of qualified immunity. Meaning that, if you are the office holder of president, everything you do has carte blanche, de facto legality. Sure, some future court could devise a test for this official vs unofficial distinction, but it means nothing for the near future. Biden is now a monarch with no legal method of stopping whatever he wishes to do, so long as it doesn't explicitly fall outside of the extremely broad powers of the executive as defined by SCOTUS and the constitution. Likewise with any future officer holder.