Not necessarily. Much litigation required to look at the facts and law of such occurrences.
Classification and declassification processes and procedures are for the purpose of giving proper and orderly notice to the executive branch employees and/or to the public so that it is properly communicated and so that the underlings may know how to treat it and what classification status they can rely upon.
That does not apply to the president. He can declassify immediately it for his own usage per his ultimate authority under the Constitution even though it may take much longer for the bureaucracy to go through every thing and reclassify it for the public or the bureaucracy. Similarly he may declassify and - as we seen under Wray and Garland they may refuse or foot drag to carry out the declassification of certain material that Trump declassified because they figure he is gone and they do not need to release material that makes the FBI and the DOJ look bad. That does not mean it was not under order to be declassified or that Trump was not entitled to treat it as such for himself.
Garland - after his Mar-A-Lago- needs to try the case now. Go for it. I don't know, and neither do you, exactly what documents he had and how they related to his alleged declassification. But there is no turning back if Garland knows what's good for him. He can't just say, "well we got some boxes back" so we are done. Nope. Let's see the indictments and get on with it. The legal issues will be fully addressed in that process. If Garland backs down, well, can you spell "witch-hunt" boys and girls?
Once again let me post the detailed information on declassification of documents by a President...
Under federal law, Trump does not have the power to unilaterally declassify documents. There is a review process for this -- where the original classifying authority has to declassify the documents at the direction of the president -- for declassification to occur. The president cannot merely wave his hand over a document and claim "now this is declassified". There is a process that involves written documentation and several other steps.
It's not the case that a president can declassify documents with just verbal instructions. His instruction to declassify a given document would first be memorialized in a written memo, usually drafted by White House counsel, which he would then sign.
Typically, the leadership of the agency or agencies with equities in the document would be consulted and given an opportunity to provide their views on the declassification decision. As the ultimate declassification authority, however, the president can decide to override any objections they raise.
Once a final decision is made, and the relevant agency receives the president's signed memo, the physical document in question would be marked — the old classification level would be crossed out — and the document would then be stamped, "Declassified on X date" by the agency in question.
Former Trump administration officials have claimed that Trump previously declassified the documents taken with him to Mar-a-Lago, but that the classification markings had not been updated.
https://www.cbsnews.com/news/trump-classified-records/
Here are some additional sources with facts to help you out.
https://www.theatlantic.com/ideas/a...fbi-raid-classified-nuclear-documents/671119/
https://www.nytimes.com/2022/08/14/us/politics/trump-classified-documents.html
https://www.nbcnews.com/politics/do...ago-documents-experts-say-unclear-w-rcna42311