I held such a clearance too. You are misunderstanding the difference between authority and officer.
The authority decides what is classified. The officer enforces the rules for the classification.
As President, Trump can do pretty much what he wants. Congressional laws cannot change his authority to declassified. Once declassified, the officer only enforces the rules for unclassified info.
The process to publish declassified info is downstream from the declassification.
You were a classification officer, not an authority.
I am not misunderstanding anything, nor questioning Trump’s authority to declassify. The idea that Trump would issue an oral standing order that anything he removes from the White House is automatically declassified is ridiculous. If that’s his defense, it might not hold water in court. I don’t think Trump is that foolish.