See I don't necessarily believe all of that. Don't get me wrong, the offense and midfield play this year have been atrocious, especially the last few months. There was an article by ESPN during the international break that showed if you removed all set piece goals, then Arsenal were still in 1st place, albeit level on points with City. They were the 3rd team in Europe to eclipse 100 goals for the season behind PSG and Barce back then as well.
Yes, the tactics and especially in match adjustments have been incredibly poor, but just as bad has been player form. The midfield can't break a press to save their lives nor are they finding and tracking runners. The defense is handing out multiple goals every match. The offense has shown zero capability to finish when it matters.
When players have started to look good, like Havertz or Eze, they're immediately injured again and out. When they come back, they are starting from square 1 and it shows.
Don't get me wrong, Arteta should take a massive amount of the blame, but the players themselves should be held accountable as well. They are just as culpable