Not sarcastic. I doubt, for example, that Tradefortress kept all his coins in Input.io's wallet, and that too was supposedly a hot+cold wallet system.
Didn't Tradefortress's cold wallet "leak" much like MtGox's? I don't know how this happens, other than if the cold wallet was a lie in the first place.
JD's is real, and is as secure as any cold wallet solution I could come up with for my own coins.