Are you dumb? Sasuke was on the promotional art because he was in the movie. Logically Naruto is still alive. Who puts a dead character on the promotional art? That's like putting Madara on the promotional art even though hes dead.
Also all the characters on the art are relevant and still alive.
Still alive, yes. Going to die later on? Probably. The fact that Naruto is on the promo art doesn't mean he's going to survive all the way through, just that he's going to appear. For more examples, see literally every work of fiction ever made where a character dies.
You act as if once we've run out of Movie to copy, the manga is suddenly going to snap back to Kawaki doing his stuff with no time to show what happened.