I dont like the way the judge worded that.
If the President is working within the bounds of his constitutional authority there is practically nothing he can do unilaterally.
The only power the president has unilaterally is the powers of the commander in chief which is very limited.
The power of the president is almost totally encompassed by the words : he shall have Power to grant Reprieves and Pardons for Offences against the United States, except in Cases of Impeachment and The President shall have Power to fill up all Vacancies that may happen during the Recess of the Senate, by granting Commissions which shall expire at the End of their next Session.
He is only the “Commander in Chief” after congress has declared a war. Congress hasn’t declared war since 1941