Well, he wasn't really " ing". He precised it in following tweets where he said that it shouldn't be taken like that. He was just noticing that for the first time in a long time he received a DNP-CD and that he now needs to work on his game.
Saying that, unlike what he shows in interviews, De Colo is a player with some at ude and a lot of ambitions. If he feels that he doesn't get the playing time he deserved, he will complain about it. In Europe, he has still criticized some of his coaches choices in Spain and with the national team. Coaching an ambitious player has some drawbacks but some edges too and I trust Pop for being able to take the best of it.