They dominate in terms of chances and possession so it is very natural that they managed to bring 3 points in this match.
Now Arsenal are quite comfortable at the top in the group stage and they have definitely qualified for the next round which of course makes the fans happy because they have waited a long time to see a moment like this.
A narrow victory at home for Arsenal is indeed a very important moment, because apart from Arsenal being able to ensure itself to qualify for the next round, PSV must also try to make itself qualify for the next round and I think PSV should also be able to do that because considering there are two the remaining matches and one of them is against Bodo/Glimt in which PSV must be able to win in order to qualify for the next round.
The second match will be held at PSV headquarters and this must be maximized well by them, but indeed looking at Arsenal's condition and seeing their first fight it seems revenge will still be difficult to happen.
It would be a different story if Arsenal played some of their reserves to rotate players.
I would be at stake but looking at the situation of the players that Arteta plays.