Its just another baseless claims and anyone could say that they are winning consistently. But what hard to provide is the proof since if you are experience gambler its really hard to earn those figures he said or lower than that consistently. Usually we can hear this claims for those people trying to catch curious people then pull something bad to them like scamming. Although I'm not accusing that OP has bad intention but he really sounds like that for stating that unfeasible claims.
I have the same feelings. But as long as he doesn't offer anything, he doesn't have to prove anything. But I am pretty sure this is not as easy as it sounds. If someone has great experience and has a lot of patience, knows a lot about sports, and is up to date with the news, they may get a better result than others, but that does not mean others will be able to reproduce the same result.
I heard people make a lot of money from Horse racing. But I don't even know how this sport actually works and which horse is better than which one. So, I am sure I won't be able to make a single dollar from Horse racing.