It sounds to me that they're trying to work around their own beliefs which is just weird to say the least.
I'm not a muslim and don't consider gambling a sin but I believe that you shouldn't knowingly commit the same sin every day even if you pray and do something good right after commiting that sin.
I agree with your statement.
From what I have heard and learned, gambling is absolutely prohibited under the Islamic rules and regulations. According to them, Allah has forbidden gambling and it is considered as a sin. Seeing a Muslim working around and circumventing such is somehow displeasing to see but I guess they have their own discussion about it.
Though this may be the case, a concept of a "Halal" casino is potentially bound to fail. Imagine, naming a gambling casino in a Muslim term definitely spark red flags on it. I doubt that Muslims and other people would even attempt to try this without going against their beliefs.