It seems Hearn wants to milk Joshua as much as he can before he retires therefore he is still making a lot of noise from time to time in the media in order to keep Joshua in the news. Hearn wishes that he could get Joshua to fight the winner of the Fury vs Usyk fight (or Fury is he loses) but that is simply not going to happen.
I think he wants it, but he will want the Fury fight more and it's a question of sinking further down the pecking order with a loss to Dubois again. The smart money move would be to wait to fight Fury which can easily be the next fight assuming Fury doesn't beat Usyk. Dubois is fighting earlier next year according to Warren and Hearn said AJ won't be ready by then. It could be BS or a stalling tactic as there's no reason why he couldn't be ready by then but the smart thing would be to wait for the Fury/Usyk outcome. He could be waiting a while though if Fury takes some damage or decides to take some time off so it could be late 2025 before we see them. Both may decide to take easier fights also but I think both fighters may just want the big money fights now given they're likely coming towards the end of their career and both will be out of line for belts etc. Maybe a tune up fight in the meantime but again that risks taking some damage or even worse if he loses. The money is there for this fight though so I'm sure it will happen at some point. AJ could redeem himself with a win over Dubois also but that's a huge ask. He did it against Ruiz so I think he can do it again, though Dubois is obviously far more dangerous that Ruiz. There's also no news on who Dubois will be fighting so maybe he's also waiting for the outcome of the Fury/Usyk fight and Dubois could rematch Usyk given the controversy in that. Usyk might want to get his belt back so it's a great opportunity for him.