Obunga immediately issued an EO sealing any access to his past, who knows how tight this seal is, and what databases are included? Wiping the electronic records would not be beyond the creep, and within the capability of the NSA.
The president and vice president, alone among all government officials, military and contractors, do not have to submit to a security clearance and background check, as they are the grantors of access. It’s possible that Joe Biden went through one during his long service in the congress, but I rather doubt that Barack Obama did. Convenient, no? When I was in, President Carter revealed some code words and other secrets during a public interview. Did he get in trouble? Not at all, those things were immediately considered “declassified” since he had said them.