Metawin is now in their limelight, they can never fabricate such a story and I don't know what they stand to gain doing that. What baffled me is that you ruled out that it can be an insider job, lol, you shouldn't do that because you are actually assuming that.
An insider job does not mean the gambling site owners know about the hack. It can be some of their workers. There are some cases that were investigated that were later known to be an inside jobs. All are guess, no one know who the hackers are.
You are right and I added it differently on the post you brought this excerpt. Trusted employees could do and undo, it's not news and it doesn't mean the management knows anything about it which I also believe is true in the case of Metawin. The management has nothing to gain in this heist since they do not let it affect their customer. This means that they are the ones who will singly face the brunt, we can only suspect the management if they are unable to pay or even close down.