If anyone knows, please pass it along.
UPDATE: As approximately 6,000 people told me (thanks to all of you!), starting with Allen Becker, Hikaru Nakamura won his Chess.com "Death Match" against Wesley So by an overall score of 21.5-11.5. Nakamura won the 5' + 1" stage with an undefeated 6.5-2.5, split the 3' + 1" stage 4.5-4.5 (with only one draw), and won the bullet (1' + 1") finale 10.5-4.5 (again, with only one draw). There's a nice report here, and I think there are others in the comments section as well.