That does look like checkmate.
I assume that it will resolve at some point that it is checkmate. I know that when people get banned, daily games aren't immediately terminated.
If it doesn't , you should send a note to support@chess.com with a screenshot.
Hello, I've won this game by checkmate but there was a server error when i made that move, and now the game is still going but I'm losing on time.
Can anyone help? Thanks!
https://www.chess.com/game/daily/420432029