This is still very hard to believe, there is no such thing called honor among thieves, how can an hacker go through a lot to hack a security server just to return the money they stole? This doesn't sound right and I believe that we are only hearing half part of the truth
Although his action could be consider stealing. He did emphasis some of his action, I find it quite suprising he will return the funds. Maybe it will hard for him to spend it or exchange. But if you are gonna be jail for doing something its worth to keep the money right? But he indeed return the funds meaning he is confident of his stance. This show how efficient he is anf dont scared that he will be tracked. Anyway its not like a good thing to follow.