You remember that Arsenal losed the EFL Cup 3:1 to West Ham, while Newcastle defeated Manchester United 3:0. Although I was just thinking that Arteta had a different plan for the important match against Newcastle, which is why they lost, I was totally wrong then to think that way because Arteta substituted a strong team in the second half of their match against West Ham, i was thinking that he did that to avoiding any injuries among the players. Considering how well Newcastle has performed this season, I was expected that either Arsenal win or the game end draw. Arsenal was unable to score a single goal against Newcastle, that am actually shocked by the outcome of the game when it ended like that.
Yes I do remember that but I don't consider the EFL Cup as important and I think most of the coaches don't either.
But I agree with your sentiment that Arsenal was going to win or at least tie the game against Newcastle United. But as crazy as the goal was with all these uncertainties and VAR, it wasn't that surprising that the game might also find a winner that is different from what most people would expect.