No it does not. Those are just gambler's fallacy. There is no way thinking positively will affect your gambling outcome. It totally depends on your luck. Your emotions will no way chance the mathematical variations on any way. Thinking positively just brings an inner hope to light that helps you to stay focused. That's it. Does not matter if you play with a negative or positive attitude, the results will always be the same.
With positive thinking at least we can control our emotions so hopefully we will able to limit our gambling habits. Indeed, positive thinking won't change the outcome of our games, but it may help us at the other side. Gambling is a game that will involve emotions and if we have no clear mind while doing it, we can end up badly.