Yeah Arsenal's improvements so far have worked even if it's just a pre-season match especially the new players who joined this season like Kai Havertz apparently didn't take long to adapt he has scored several goals but yeah maybe because he's used to playing in the Premier League. I think Arteta should pay more attention to defense because in the last few games they have always conceded goals, we don't know if Arteta is experimenting on defense so far it is clear that there are many gaps there. The real competition is about to start so there is still time.
Arsenal won 2 of 4 pre season matches and not really bad perform after winning against Barcelona on last matches, actually not really important what achievement by Arsenal on pre season match due Arteta have tried with several formation after arriving some new player in this summer transfer. Arteta have to push their defender how efficient clean sheet on every match after conceded three goals against Barcelona and loss two goals from Manchester United.
Arsenal have one pre season match left against AS Monaco before facing Manchester City in FA Community Shield three days later, Arteta have huge motivation to revenge after failure winning Premier League last season loss compete from Manchester City, its time to proof for public who is better between Arsenal or Manchester City.