I think that Jack Hershey does exist, but not in the form that he would have us believe. He pretends not to care what his detractors have to say, as though he is above it all. And yet, he goes out of his way to post lengthy, dismissive diatribes. Like a cat that goes out of its way to sit in front of the TV while you're watching, just to let you know that it is ignoring you and doesn't care. I think that even a blind dog with a sinus condition would be able to sniff out the imposter in the room.
Jack doesn't want to prove his performance claims because it is so much easier and more fulfilling to tirelessly write long-winded, dismissive posts. Why would he waste precious minutes providing documentary evidence substantiating his exorbitant performance claims when he can spend countless hours telling you how little you know?