With the return of Kevin de Bruyne and Haaland I think Arsenal will find it difficult to win the EPL title. I think Arsenal is still having difficulty appearing consistently in every match, especially since they don't have as good a squad depth as City. I think they will only be able to finish in the top 4 and get a Champions League ticket next season.
Although De Bruyne and Haaland still got injury, Arsenal still gets difficulty to win EPL title. You must be aware that Arsenal is no longer in the top of EPL standings, Liverpool is in the 1st place. Arsenal dropped their position to be the 4th place. I think the EPL title competition will be between Liverpool and Man City. Arsenal performance decrease quite a lot, they experienced 3 loses and 1 draw in the last 5 matches. So they only won 1 match only. It is too bad for Arsenal, they missed too many points.
Salah's injury will greatly affect Liverpool's performance in the future. I think Liverpool's next few games will be difficult because Salah is their best player at the moment. I think Salah has created almost half of Liverpool's chances this season with his goals, assists and creativity on the field.
I think you are too early to claim this. I think Liverpool has some wingers, Klopp can replace Salah with another winger. Harvey Elliott is one of the player who can replace Salah, but surely Salah is still better option in the right winger. Or Klopp can have another option, it is to change the formation or change the tactics. Klopp is a smart coach, I don't think Liverpool will be difficult to deal with the situation.