Sadly, no. He didn't. At least, according to his Chief of Staff in a sworn testimony, Mark Meadows, Trump himself said that his tweets are not policy.
So. What next?
Because we've already discarded the idea that the FBI planted the documents.
We know that he didn't officially order the documents to be declassified because there would be a paper trail. He didn't tweet about them (also, that tweet was about the Mueller investigation, which he never released) He specifically and expressly told his Chief of Staff that tweets about releasing information weren't policy.
Also, we know from his own court filing that Trump is not disputing that the documents were classified. He's only asking for a Special Master to sort through the 300+ to make sure his personal papers that are mixed in are returned to him.