In the last two seasons, Arsenal started well, but in the middle of the season they declined, then improved and at the end of the season they declined again. That's why I wasn't surprised by today's result. I wouldn't consider Arsenal as the type of team that will win the Premier League. They may have a good squad, but they are inconsistent at the most important moments. Whenever they have a good chance to lead the table, they waste it and when they are lucky enough to be at the top, they also waste it. That's why in my opinion, with today's defeat, I see them outside the list of teams capable of winning the Premier League this season.
Now they face 2 big matches in front of their eyes where Inter in the Champions League and Chelsea are ready to be their opponents in the EPL. If in the end they lose points again in this match, it is difficult for Arsenal to be more focused on continuing the competition especially for the EPL where they are now slowly moving away from the competition.