The president can personally violate any law without legal consequences.
This isn't true.
They ruled that the President has criminal immunity for official acts in line with the constitutional rights and duties of the POTUS.
They also ruled that non-official acts, or acts taken in a personal capacity as a private citizen, are not immune to criminal prosecution, and that there's a large gray area in between the two where it needs to be decided on a case-by-case basis.