I simply do not know what Biden means by that suggestion. Bear in mind, it was the hapless Trump DOJ that gave us the Mueller Investigation, whose internal leaks supported the subversive promulgation of a fantasy narrative for three years. Perhaps Biden is saying that his DOJ will not permit a focus on issues involving the Biden family's alleged corruption, no matter what evolves or is eventually exposed?
But no worries. Whatever the intent of the presumed President-elect's comment(s), I am reasonably sure that all of Biden's words will be subject to the trending Leftist "reimagination," if America wakes up to a Democrat controlled Senate on January 6, 2021.