In the first meeting this season, Arsenal was able to beat Manchester City at the Etihad Stadium. However, beating Manchester City at home is not an easy job for Arsenal. This season, Arsenal is indeed performing better and is leading the standings, but the opportunity to become champions is still very difficult for Arsenal because the opponents they will face in the future are very tough.
It was a fluke, I'm sure this time it will be different. It's nothing new Arsenal only strong during beginning season, but when there are many players injured and their schedule getting tight, their performance will drop unlike Manchester City.
The best result that can be achieved by Arsenal is draw, otherwise Manchester City will destroy Arsenal until The Gunners are crying lol.