Hmmm..
I have just had a hack around with an old dip chip. It's relatively simple to get to the core, but pretty much impossible to get the core away from the body intact. I have no idea how they did it in that picture.
I suspect the chip itself plays a big part in it. If there is a void above the silicon, then it'd come out fine. If there is no void (like there was in my chip) then I can't see how you can get it out. In that case chemistry is your friend.