What he says seems unrealistic. We clearly were strongly in on him. But he has to find a middle ground between his feelings for Juve and being at that club.
I don't think he's the kind of guy that would let his emotions drive a decision or he wouldn't have coached Inter nor Napoli at all. And he wouldnt have quit Juve when he thought the project doesnt set him up for success. He's ultimately looking out for himself first as most coaches would.
If he did negotiate with Juve then he did so from a place of strength - he holds the leverage as he just won the league with Napoli and is favourite to win it again. He is not desperate he is very comfortable and so if he joins us then it will be on his terms. When he joined us the first time, he had no leverage he was a new coach who would not be considered by any other top club. This time we are desperate. We sacked our coach mid-season and our director of football just a few weeks ago.
If I were him I'd ask for a high salary and demand either a massive war chest or will want to see that the squad is in decent enough shape to compete. If I felt the team is far off of the mark, then I'll wait a few more years and let another coach do some squad building.