Try reading my reply. I know who the kid was. They moved becaused "Mark" was doing well. And what the hell are either of us doing up at this hour?
Well, ambiguous at best. A similar story could have read that the parents fatuously ignored the ongoing welfare of a kid who, in their eyes, seemed to be doing well (at first).
Anyhow, when I see "environment" blamed for [fill in the blank] doing poorly, I tend to roll my eyes. Especially when the change is to any ordinary eyes, benign. They had no a priori reason to fear problems with the kid in a richer neighborhood simply BECAUSE it was richer. That reads like liberal moneyguilt whineyspeak.