The hands are clean as a whistle, not a drop of gold on them and the coating on the arms goes all the way round the hand-hole. So I'm fairly sure the hands were added after the chroming.
Interesting theory about recycled minifigs, but the inside of the legs is also plain tan as is the small section under the arms that bigospedros noticed. I can't comment about the face (and I'm unwilling to gather empircal evidence) but it looks as if the whole minifig under the chrome might be tan, which I think suggests that LEGO did make a special batch of "blank" minifigs.
(I wonder how safe it is to chrome over printed parts. Could there be any danger of it flaking off in those areas due to not bonding properly with the print?)