So maybe he could give it a try to see if his strategy would work or not. And if his strategy fails, it seems that he needs to update it by modifying his strategy and maybe replacing it with another component.
Yes, he should do that. At the same time, though, I doubt he will. If he was so sure of this "strategy", he would use it for his personal gain.
I can't think of how much money he will spend using his strategy and how much he could lose because there is no certainty in gambling. Hopefully, he can understand the many suggestions from us and not only pursue victory but also think about anticipating the amount of loss he can get later.
The Martingale system of betting is an old gambling tactic and, as has been proven countless times, it can't possibly work unless there's no limit to how much you can bet and if you have unlimited funds at your disposal - and neither is ever true. Any gambler who tries to use it to their advantage is going to be on a swift road to financial ruin sooner or later.