Or, in a parallel universe, there's an old president who preemptively pardoned the person who might have been involved in GOF research leading to a lab leak.
It is an interesting angle, because now he could potentially be subpoenaed by Congress or anyone else, and it seems unlikely that he would perjure himself over anything after 2014.
Unless there's another crime outside the scope of the pardon. For example, crimes within the statute of limitations prior to the pardon, new crimes after the pardon, or state level crimes during the period of the pardon.