Very interesting read regarding the 500 binary bet with odd 2 and trying Martingale, fixed or proportional betting. Unfortunately I have tried all these methods before and I can tell that this article is not correct, it is never possible to have a 87% chance of winning after 500 bets with this strategy. I think you should remove this article from your website, so far no betting strategy is proven to be perfect or to have more than 66% chance which only remains a double chance bet.
All these articles are written by third-party authors, so I can not be held responsible for their content. I just tried to provide here a decent list of strategies for their discussion by interested users.