There are a ton of scammers who fake having fixed matches information but at the end of the day what they're trying to do is just get you to pay them a share of any profits you make. They do this until you lose - in which case, of course, they just stop contacting you.
I've personally seen these scams happen in the past and it's all a game of numbers. The more people they reach out to, the more likely someone is going to win and think that the matches are actually fixed.
There's no way a "real person" who claimed to have inside information about the fixed match will offer it to a random community just like here in the forum.
Any form of such offer is considered a scam. I actually not alarmed on that but rather think, are there really people who will fall on that crap?
Now it is possible he was lying to cover himself and make his offer appear more legitimate, but I will not be surprised at all if that was actually true.
the classical scam where somebody is selling illusions preying for those who want to buy illusions instead of looking clearly at reality
rationality helps a lot in these cases
that easy bets do exist or some sort of exploit or leakage which do actually exist but scammers or fraudsters do make use it as for them to be able to scam people but if you do just realize on how things works then you could really avoid and just simply stick with your own decisions and jurisdictions on things and not relying with these lies.