Pretty much my opinion too. There's no way he's safe after all the meetings and uproar. I suspect the reason Buffon stated that he's staying, especially after discussions with Elkann (if that isn't a big hint) and Blanc, is because in those discussions it was disclosed to him that there would be a new coach, and new outlook next season.
Thing is, they don't want to forfeit the last three games by having either a confirmed lameduck coach, or a caretaker coach. Nor do they want to parachute someone in half-cocked. They may not have their man yet, and frankly, all the rumored names have big question marks too. They may want to see who gets booted from other clubs before making a call.
Hence, the statements that neither commit to Ranieri, or outright dismiss him.
He's done. He pretty obviously pissed off the ownership, his players, and probably even the management.
To bring it back to Diego, its totally clear he's not a Ranieri player. Ranieri wouldn't change his formation for Giovinco, its doubtful he would for Diego. Everyone is just being professional.