GM Hess thinks that a score of 8 will be required to win the tournament, so he could recover if he wins his remaining five games, provided that Wesley doesn't go 10.5/11 or something ridiculous.
As for the explanations, I don't really know. You can probably check his twitch channel though, he puts everything there.
What's happening ?
https://www.chess.com/events/2020-us-chess-championship/06-Nakamura_Hikaru-Liang_Awonder
I would think Hikaru is much stronger than his opponent in rapid chess and even in classical.
After 6 rounds, Hikaru has only 3 points. It's a 12 round championship, can he recover ? Did he give explanations after the games ?