The whole point of that post was to show that its pointless to make millions of bets and it's in fact even better to make a single bet, you don't waste time, you have better odds and you win/lose the same amount of money
who said anything about rolling 50%? if you knew as much as you write about odds you will know how to control the odds, with other odds
The odds are calculated at 49.95% which is what an old dice casino had as odds, it doesn't matter if its lower or higher, the point is to illustrate how using martingale is a waste of time and it's worse than playing a single bet