There is no guarantee that that is his actual timezone. It is possible that he changed his clock to further hide himself.
He also could have posted at odd hours do that people searching for him would be following a red herring.
This is exactly what I was thinking. If he was really smart he would have left little things like this to throw people off, though I'm not sure if he did or not (though obviously he is pretty smart and has evaded detection for this long).