I think that trade is not possible to happen. Irving will stay and play with the Nets for the next season. He is just creating drams like before.
Moving forward to Sixers, it's no secret plan already that Simmons will be traded in the future instead of Joel Embiid. Prior the start of Season 2020-21, Sixers made it clear (I'm sure I read it elsewhere and share it here) that it was the season we might see the final Simmons-Embiid duo.
Still no news for the future of Ben Simmons but I'm sure he will play at the different jersey next season.