Yes, but then they government could not prove that Trump intended to keep classified documents, Biden having kept the classification secret. But he can right now declassify documents that the Chinese are offering millions to Hunter for. Hunter could make copies and sell them with no penalty.
Scary thought, but we should have thought of that before picking the head of the Biden Crime Family as president.
If Biden wants to, he can classify all of the material taken from MaL now held by the DNC at the DOJ/FBI headquarters, give it such a high classification that only those hand selected by himself can see it, and also classify the reason for the classification. Because that's what "sole power," means.
You might look into advocating a constitutional amendment taking some of that sole power away from the president. I might even jump on that bandwagon. But until it passes, the president has sole power of classification.
The end.