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.