Yeah, I'm not gonna blame Emery or Wenger for Xhaka being a moron in 2022. You get signings wrong, it happens. You just need to accept it and move on quickly enough, and boy oh boy do we ever suck at that. Arteta had the chance to end Xhaka's tenure at Arsenal once and for all, but he didn't and the he's to blame for that, as well as the general fucking about with the midfield position.
Think in this case, assigning blame to anyone but Xhaka is a bit redundant though, he had to play against Liverpool, no one would have left him out of the team prior to the game, and it was he alone that fucked it up.