I don`t think that they will use this paragraph in this situation. This will be the same as to steal gamblers money and after that they will be no trust to casino. If they want to use this paragraph they can steal all gamblers money and close. It uses mostly for cheaters that find something that helps them to cheat casino without punishment.
Yep, as long as the gambler haven't did anything wrong, why does the casino reserve the right to cancel the promotion? lol. That's like when gamblers won big amount on their casino, they become mad and didn't want to pay the winning, since they have a rule to cancel the promotion, he can confiscate the winning amount of the gamblers. Trusted casino wouldn't do that and Rocketpot already survived for many years.
They have a good intention to pay $16K few days ago, I don't smell they will scam @OP at the current situation so far.