I'm sure the casino waited until the last moment before firing any redundant employees. They waited from spring to open their halls. In September, the authorities allowed the casino to open with a limit on the number of people simultaneously staying there, with a safe distance between people, and so on. However, this did not help the casino to eliminate its financial difficulties and the management had to fire its employees.
And some people think that just because some casinos opened up in September and able to at least get some good revenue, these casinos are now back in shape. These people didn't realize that casinos are just recovering from their losses so it's not easy for them to ask their employees to come back at full force.
With the capacity limit when casinos allowed to re-opened, expect that the flow of a much good revenue will take time.
Give them time. If casinos don't really care about their employees, they should fire them instead of forced leave. Soon, we will survive the effect of the pandemic.