The precedent this sets is honestly outstanding. Any president can do literally any thing now. Executive branch is now quite literally a dictatorship because the president can legally do anything he wants and just say it's an "official act." Anyone who says the US is a democracy is wrong and this is some of the most definitive proof yet.
I really liked Sotomayor's dissent that basically said, "The Founders explicitly did not provide immunity for the president when given several chance to do so. This is not what they intended. The majority, supposed Originalists, are blatantly making shit up."