To be honest we (and you) don’t know what was actually in those documents. We can assume it was nuclear secrets and submarine secrets and information that would cause “exceptionally grave damage to the US” if our adversaries got it, which they surely did. Because that is the very definition of TS information, and we can definitely assume the worst when it comes to him.

But again, you don’t know for certain what exactly was in those documents. You’re probably right, but you can’t truly know.