Or they don't just want to pay and doesn't feel that the winner deserves it. You know the management of some casinos are like that, even if the winner is a rightful and genuine winner, they can have that emotion and just have to say some reasons and refuse to pay.
That was a crappy reason to start with.
If you weren't able to read the article, the highest gambling commission also did the investigation and they confirmed that the machine is really faulty.
The mistake of that casino is, they didn't do their due diligence to remove that machine that's why it ended up faulty. The machine has a sort of bug display that's why when the winning ticket is released, the stated amount was only around $2. They should at least face some penalty but the article didn't mention it.
If that casino really intends to do some cheating, didn't they realize that by offering dinner to the women will just make the situation worse? If the casino is guilty, they will just offer a big money to the women to remain silent, but they didn't.