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.
Casinos and gambling industry are indeed important to Las Vegas since it provides huge tax revenue that is essential in their economy. However, if people would still refuse to follow simple protocols such as wearing face masks, I don't think they can last for a long time operating casinos while people still don't wear masks at public places.
Before they plan on reopening casinos, they should encourage their people as well as foreigners to wear face masks for safety.
For a gambler's mindset, why should they undergo a swab test just for the purpose to enter the casino? If I'm a gambler I'd rather find other casinos with no restrictions like that unless I'm a die-hard player of the said casino. It's no different from other establishments wherein there is no need for a test.
Swab test is necessary if your place was in the high virus-infected record, but if the place that has flatten curve record of virus-infected and if they are in a modified general quarantine level, so this is a case to case basis. Thermal testing and proper guidelines for sanitation or disinfectant will be fine.
Though it is risky for gamblers to do this, I guess if they really want to they will find ways just to gamble.
It may be inconvenient and a lot of work to do a swab test for gamblers but they still should follow what is need to do. It's for their own safety, to ensure that it is safe to gamble there and to know whether you are safe from the virus.
But I don't think all casinos would do swab testing since it will take a lot of time and work. Perhaps, like what you said. Thermal scanning and disinfecting before entering the facility is enough.