Yes, but we've still seen Dick reacting to the news. We saw what happened when he thought Bruce was dead, we saw how the knowledge came to him and how he's dealt with it. His behavior in NIGHTWING and TITANS, his decisions and emotions, have reflected that knowledge. Possibly not in a natural or in-character way, but he's still very clearly very part of Bruce's death, which is only appropriate. You'd never, ever kill Batman and have his son just not even blink except to be mildly surprised when he comes back. You'd never kill Batman and have his son find out and react offpanel. But if you like, we can use Barry and Wally instead. Imagine Wally's reaction to Barry's return is to see him and go "huh? They said you were dead. Eh, whatever, what were you saying about Grodd?"
The time travel puzzles me, but mostly because it's not immediately clear to me what happens in what timeframe. The Ares-of-now, who made a bargain with Wacky Alky on a Themysciran hillside, seems very much like the Ares we know, a cool, calm, smug bastard content to stay at a remove and satisfy himself with petty nastiness and simple conflict. The Ares who Athena describes as creating Genocide is not - he sounds like the Ares-gone-mad of the original Perez "Gods and Mortals" story, a cackling evil who desires pain and cruelty and obliteration. But Genocide was created in the present... so is Ares-of-the-future here too? Or did Ares-of-now go to the future to get Diana's body and bring it back here and this is all his plan, and the thing with Wacky Alkyone is part of it?
The timeline's really opaque, which is problematic in parsing the story.