The second is the submission of their KYC, which they said did not require KYC in the beginning, but suddenly they said they would ask for this. Sometimes I think there are real gambling casinos like this in the crypto industry.
It must be a licensed casino and they have a mandatory rule about KYC, it's their right if they apply KYC on the withdraw page since you're already agree with their terms of service which is they're reserve the right to ask your KYC at anytime they want.
If you can't accept about their mandatory KYC rule, you shouldn't create your account in the first place and just gamble on KYC free casino (no mandatory KYC rule on their terms of service or you can contact their support about the KYC thing).