>and the NSA can just hand that to a private citizen?
I speculate that Trump declassified some things proactively. If I had been in his position, I would have written an order as follows: "Even though this sort of thing is typically classified, for the year 2020, all relevant info is declassified when disclosed by NSA and military sources. Do not mention this declassification order until the Supreme Court challenges you."
So the NSA can go ahead and drop whatever it likes, and the Deep State can scream for the Supreme Court to punish the NSA, and then the NSA shows the order to declassify, signed DJT, best POTUS ever.
That's just my speculation, if you've got a better theory, I'm willing to listen.