arsenal has a target stop in the top 4 is very reasonable IMO. Arsenal's opponent in the EPL match is Brentford and most likely arsenal will win but after that arsenal will face Tottenham and Liverpool, I'm not sure if arsenal will be able to maintain their position in the standings while man city continues to follow from behind with great potential to shift arsenal's position.
Looking at what they have played in the past season, it will be a bonus point for Arsenal when they meet with Brentford and it could also be a draw line if they fight hard because of what they did to Manchester United last few weeks, besides it is their home, they wouldn't want to be shamefully defeated by any team.
History always has it that Arsenal always find it hard to penetrate through Liverpool but now that Mane who always create a chance for them is gone, who knows they can protect their defences and focus on attack, Tottenham is the same, it is not a team they can flip with goals.
Winning Brentford is not going to be as easy as predicted they have managed to win the likes of United with 4 goals and leads with 5 goals conceding only two goals in six matches. And in all their premier league matches the have had at least one goal. It will take Arsenal more effort to play Brentford compared to what how much effort they gave when they played against united. It might turn out to be more easier for them when they will be playing Liverpool seeing how their midfield keeps having lapses