China Joe .
People not familiar with the reasons things are classified mistakenly believe that its about some “secret”. The content of documents is classified to protect the sources or methods that would be revealed if our adversaries knew what we knew and how we knew it.
Since any intelligence related to Biden and the Chinese influence peddling is well know to China already it can’t compromise a source or method. All the classification can do is protect the participants in the compromising acts from scrutiny by public watchdogs.
However, if Biden had no “need to know” regarding the contents of the material he took, and if this information was revealed to our Chinese adversaries it would suggest he may have been a source in some quid-pro-quo scenario.