Contrary to Liberal interpretations, this ruling doesn't change much. If the President was capable of openly assassinating politicians, or launching a military coup to overthrow democracy, they would not be deterred by 9 people in black robes telling them they may be liable to criminal charges in the future for doing so.

Until the Chief Justice gets their own division to command, the Court only has as much power over the Federal Government as they are allowed to, which is invariably determined by their usefulness to politically dominant factions of Capital. See what happened after the Marshall Court made a decision impeding the interests early-American Capital had in forcefully dispossessing Indigenous peoples from their land.

I still believe the most incisive commentary on the Law's function in society was given by Marx. He succinctly attacks the Liberal idea that all social structures (economics, politics, etc.) arise from the letter of the law. Rather:

Society is not founded upon the law; this is a legal fiction. On the contrary, the law must be founded upon society, it must express the common interests and needs of society — as distinct from the caprice of the individuals — which arise from the material mode of production prevailing at the given time. This Code Napoleon, which I am holding in my hand, has not created modern bourgeois society. On the contrary, bourgeois society, which emerged in the eighteenth century and developed further in the nineteenth, merely finds its legal expression in this Code. As soon as it ceases to fit the social conditions, it becomes simply a bundle of paper.