There's always an alternative interpretation and one should never jump to assumptions based on limited evidence. Anyone wanting truth must keep an open mind. A hand warmer, by its nature, retains heat for as long as possible. That ability is due to its thermal conductivity properties - the same properties that will retain cold as it does heat. Is this rather Heath Robinson arrangement simply to allow the temperature measured at depth to be retained as it is pulled up into daylight. A better, less cynical view of its purpose is merely something to aid more accurate temperature readings. I see no conspiracy or fraud. I do see on Watts blog someone blinded by cynicism.