This is explicitly about the POTUS being immune from prosecution for official acts like commanding ST6 to assassinate someone. Fortunately in some cases, unfortunately in others, semantic wordplay akin to “could god microwave a burrito so hot even they couldn’t eat it” has little effect in the court system. That is to say, semantic gotchas like “but actually it couldn’t be an official act because the very act is against the constitution” have no sway.