I don't read it that way at all. I think he's just frustrated because he's not getting on the field.
And the comments made by the Giants coaches are pure BS. If they didn't think he was ready then why was he clearly in the game plan week one until he fumbled.
To me this is just a stubborn coaching staff who benched the kid when he fumbled. And for the record, when you do that kind of thing to a player you get him worrying more about holding on to the ball then making plays. You can ruin a player's ability to excel when you punish him for fumbling with this kind of severity.