I think a win adds to the confidence of a team all the time, but when a team realizes that it can beat PSG with a groundbreaking 4-1 that gives an extra portion of confidence not only for the Champions League, but also for the Premier League. I am still missing some new big names on the team of Newcastle United as I thought they would use the transfer window and buy some stars. Maybe not superstars, but players that have proven themselves in a strong league over some period of time. These players are doing well, but it couldn't hurt them to have one or two players that also bring a different aura to the team. But maybe that is what they exactly not want and they think it could hurt the cohesion.
It is a sure thing that Newcastle is still in doubt because it can be said that they are currently a debutant club again after 2 decades of not being in the Champions League and the group is also unfavorable but with this big victory clearly makes Newcastle gain confidence very well.
I honestly don't know what Enrique is trying to do with the 4-2-3-1 formation by keeping Mbappe behind Ramos as a striker because if you look at this condition it is not the ideal position for Mbappe because he is always on the wing.
As usual they were dominant but Newcastle tamed them very easily in this second Champions League game.