If they are asking for KYC information then you should give them the information because nowadays most of the online casinos require that KYC information from the users and every user of the sites know that the casinos can change their T&C without any prior warnings. Your refusal to KYC might put your account and your funds at risk and you should better know that.
Never heard of this site, generally there are a couple of red flags here though:
1. Curacao registered site
2. Very little history/info on site
3. They appear to have a shitcoin called
Lblock that has lost 99% of it's value in a year
If we are technically good and are into online casino thing then it's a sure thing that almost every other casino site has the license from Curacao and if you are saying that a site that's registered in Curacao is a red flag then you're wrong with that assumption. And, there are many sites that start proving their services to customers and they don't have to be 5 years in the business.
Sometimes a coin doesn't work very well and when it has no good utility it starts loosing its value over time, and I think the same is the case with that coin and if it lost it's value then that doesn't confirms that the site is a fraud or has something wrong.
Back to OP, I recommend you to complete your KYC information and then ask them to unfreeze your withdrawals and record the process in the form of screen recording and screenshots and even after KYC they refuse to pay your money, then and only then you should create a scam accusation post against them so others could avoid such sites.