Well, no, it's not that he is less people-friendly now, it's that he was never people-friendly. He was taking food from your hand because he was starving and not because he was friendly, my dear. And your previous depriving him of food and forcing him to eat from you hand did not endear you to him, quite the contrary, you pretty much proved that, exactly as he suspected, humans are not to be trusted.
It's like Wolf said, ALL birds need getting used to their new home but an aviary IRN is 100 times harder than, say, a hand-fed gray, macaw, amazon, Senegal, etc. so you are going to need to put A LOT of work and time into the taming process because this bird is not imprinted to humans. And, after the bird learns to trust you and like you, you will still have to keep up the work and time spent with the bird on a daily basis or he will revert. This has nothing to do with you, mind you, it's the way IRNs are and why they are not recommended for newbies.
You need to keep the bird to a solar schedule, feed it a fresh food diet for all day eating and seeds for dinner (this is particularly important with this species), put its cage against a wall and high enough that his roosting perch is at eye level as well as in a place where it gets natural light. Then you need to sit with the bird every single morning at around 8 am to have breakfast with it (you should not sit so close that the bird feels he needs to back away from you, he needs to feel comfortable with the distance between you and him so you need to get him used to your presence close enough so he can see you eating). Talk, sing, whistle, offer a treat and, if he doesn't take it from your hand, just put it where he can get it without making a big deal of it (he needs to learn that you are ALWAYS the bringer of good things). Sit again with him in the afternoon when he becomes active after his mid-day rest or nap, watch TV, read, play video games, etc. The idea is to get the bird used to your presence in a quiet environment and for him to learn that you are no threat so don't stare at him, always look at him out of the corner of your eye, use a high voice with a singsong when you talk to him, praise, praise praise and, most of all, don't become impatient and try to rush things because, if you do, it will backfire.
You need to realize that, given the species and the fact that it's a parent-raised bird, this will not be a quick or an easy process. It will require A LOT of patience, consistency and persistence -basically, a BIG commitment because it will take a long time before you see any real progress. You also need to realize that even after doing all of these things and after the bird is tame and learns to trust you and even love you, you still will not have a cuddly bird because this is not a characteristic of this species.





