The short answer seems to be that Vice President Harris — who is already poised to be the new Democratic nominee — has a strong claim to the funds, because she was and is on the filing statements as a candidate with Biden. . . . .
Some right-leaning campaign finance lawyers think it’s more complicated and don’t think it’s a slam dunk that Harris has access — despite the Biden campaign already changing its name to the Harris campaign.
Regardless, practically speaking, the question may be moot in the short term because of how long the Federal Election Commission takes to adjudicate complaints. Harris would almost certainly have access to the funds through the compressed campaign, and there’s little to nothing the FEC can do about it because of the timeline.
In fact, as some have pointed out, there are still open complaints to the FEC from the 2016 campaign.
Note: Similar stories are in the WSJ, The Hill, Forbes, and other outlets.