Trump seems to be claiming that he could declassify documents by thinking they were declassified. He wants us to share his belief that by merely wanting them declassified, even retrospectively, he could declassify any number of documents, even though he might be the only one who knew that they were magically declassified.
This sort of magical thinking works well for Trump, for it is simply delusional, thus appropriate for a man who could make believe that he won the election and that all the world admires him.