Warning: Do not pm this guy. He may be expecting that just to scam you. Do not believe in fixed match. If it is a scam, he will tell you to use your money to bet that he will give you fixed matches to bet with, that if you win you will give him certain percentage of the money that you won. But when you lose over and over again would be when you will know that you are scammed.
In a norm, I don't believe someone who has made such an amount of would even want to review such information he would rathe want to continue milking the betting platforms codedly than wants to letting people know of it, and besides who wants to share this kind of information which may hurt his source of income if many people are found doing same thing.