Newcastle are considered to be the most inexperienced team in Group F. This team is new to the Champions League platform. However, they are now top of the table. They got a great win against PSG. I thought the match might be competitive. But in the match we saw the dominance of Newcastle players. After sharing the points against Milan in the away match, the team got a great win in the home match.
However, Group F has become more competitive. Milan have drawn both of their matches. On the other hand, the Dortmund team is strong but they have earned only 1 point in two matches. Milan and Dortmund will surely battle it out in their next match to climb the table. Every match in Group F will be very competitive.
There is something more important to this win and that is the margin by which they won. If they end up being equal in points with PSG and they share rank 2 and 3, the direct comparison will decide which team will advance to the next stage in the Champions League and which team will be relegated into the Europa League. Winning 4-1 can be so important because PSG would have to beat Newcastle at least 3-0 to then have the goal difference decide about the order in the table. I think that's one reason why this defeat is really bad for PSG. It raises the pressure even more for the next games.
Exactly, this victory for Newcastle against Paris Saint Germain has double significance for the standings as you have clearly specified, from now on every match will be fought until the end and in my opinion Milan is the one that risks the most for the moment, at least that manage to get at least one win against PSG in the next two matches