He was referring to the notion of him being exchanged in co-own with D'Agostino I think, DC also commented on not hearing anything about being half sold to Napoli, and then being said in the media its almost done (if its for real, not even getting a word from the club, Freshwater was angry with Inter in similar stuff, he was sold to Genoa without a single word from the club). We treated Criscito rather cold, so I would understand some annoyance expressed from the youngsters in case they arent given the chance and offloaded, even if just a loan.
Gio seems bit peeved that it would even be up for debate, but also its the after effects of the Ranieri stuff, he rightfully said he wants to be treated and given the same chance like everyone else. Not benched and tossed to the no mans land DESPITE showing excellent performances (why he said he knows his qualities, and that at times it felt it wasnt being appriciated by the club, its true with the Ranieri BS, and not that the board should do a Berlu and dictate, but they didnt seem to care much).
But he is very patient, and repeatedly mentions he doesnt demand starting spot, and wants to stay in Juve, so I wouldnt say he is immature, he is just frustrated to not being given his due, I feel for him, as should we all.