Perhaps, if without those claims of profitability, Jack's input/ idea of offering a free system is aimed to stimulate others for additional input to finalise a truly profitable system. Just perhaps.
To certain degree, I would agree with you (and Jack) that commonly available (computerised) backtesting tools sometimes may not be able to produce correct profitability results fully.
That's one of Jack's pipe dreams. He wrote a couple of weeks ago that a first setup for a backtest was in the works. So Jack NEVER RAN a BACKTEST. How can you justify then the above assertion. Only BS like all the rest of it. Jack believers, keep on losing. One further comment. You could as well say: ... that commonly available (computerised) trading tools sometimes may not be able to produce correct profitability results fully. This is true for all tools at all ages. It's simply up to the skill of the craftsman putting those tools at work. Leonardo da Vinci once said: "most people only produce sh*t during their lives." He must have been thinking about the ET popular wisdom of 95+% losers.
That would be very true, as the "Fully" above is the keyword that Jack's followers would like to hear.
I've often thought that one of the many things on Jack's agenda is to toss nebulous scraps of trading "wisdom" to minions, hoping that one of them will eventually discover something that really works. I've seen people spin their wheels with his stuff for years on Usenet.
Backtesting tools have become more and more sophisticated. In the "olden days" vendors and Svengalis could claim just about anything. The trading public started calling them on it WAY more when the first TA software came out. Now almost anyone can backtest almost any idea, to include those requiring historical fundamental data. Which means Jack needs to become even more vague Woodies CCI people and Grobians are quick to slip into their classic backtesting denial mindset when someone proves them wrong because their need to believe is so great. Kinda pathetic actually.
I have serious doubts about easyrider's success... if you check his posts, there's nothing about it until, all of a sudden, he needed "proof" to defend Grobian teachings.