If Eddie, the owner of stake did confirm that the match in question isn't fixed and that those who betted on the very same match were all paid their winnings, not just stake but across all other online gambling casinos as well; as the victim alleges, why or how did the very same game from the very same provider that stake works with, turned out to be a fixed match on shuffle.com and on stake and every other casinos, the same match wasn't flagged as fixed?

Well, it's rather unfortunate that shuffle is getting involved in this type of mess, I would advice you guys find a way of sorting this issue out now and amicably, if it has to be to pay the user his money, give him back his money and regain back your reputation, or provide evidence that showed or shows that the match in question was indeed fixed.