Thanks Yola, yes he is
It used to make me incredibly sad, DM, because really until fairly recently I wasn't sure he was ever really going to enjoy life (living with beings he was uniformly terrified of). I even cried about it a few times
But now I see it as a personal victory on his and my part

He's been so brave and good and clever about it, and now when it's time to be fed he'll tentatively walk around my ankles (depending on where I'm standing, he might brush against the sides, but he's not sure about the front or the back yet) and talk to me, and whenever I'm in the kitchen for more than 30 seconds he comes for a fuss

It's been brilliant seeing him come along like this.