Arsenal are still unbeaten against weaker teams and it looks like this will go on like this for a long time. However their problem seemed to be in away matches against strong teams. They lost to Manchester United for example and their performance wasn't satisfying at all. Arteta will need to focus on winning those matches also as it is their weakness.
They got quite a striking score in this match and interestingly 4 of the 5 goals they scored came from very young players because their Odegaard, Martinelli and Reiss Nelson are under 23 years old and of course this is a good prospect for Arsenal.