If they are planning to reopen casinos, they surely need a concrete plan on how to implement those protocols for the safety of workers and gamblers. I think casinos are part of those businesses who will reopen first because casinos are popular and it's one of the major businesses in Las Vegas.
I checked the link you gave, and there's a short interview regarding people's opinions about mandating facemask. I don't really get why some don't want to wear face masks when it's for everyone's safety. There's always a lot of people in Las Vegas and it makes it more dangerous, yet some of them don't want wearing a facemask.
It's going to be a slow and long process before we can see all businesses in Vegas being open in public But obviously, casino will be the first one as it will generate the needed money to keep Las Vegas economy up again. I also don't understand why there are people who are against wearing mask. Perhaps they think that it won't improve their chance of getting infected. But at least you have this sort of first line of defence against a spread.