No I don't get where you think that. His ability to review or own government documents, much less secret ones, ENDS when Biden is sworn in. Anything after that has to be through permission of the Federal government.
More fun: seems like Trump's own attorney is now a potential subject. She signed and affadavit that she had searched the locations in response to the NY suit. Unless she has a security clearance she potentially saw lthese documents in violation of law, or lied to the NY AG.
A filing by Alina Habba in the case over Trump’s business empire could create exposure in the matter of classified information being stored at the ex-president’s home.
www.politico.com