It is a well known issue that they have the slowest withdrawal process, maybe atm they do not have that amount (9.84btc) then they asked you to make 49 x 200mbtc withdrawals. Indeed, it does not make senses why they should ask this type of withdrawal.
Keep updating your issue here and in the scam accusation thread, hope you'll get your money. Anyway why you decided to deposit and play in this site while there are some issues like their rigged slot games and slow withdrawal?
The power of hindsight here. I didn't find their site from this forum, I only registered in September here, but I had an account at BTC-Casino from 2015 already (I played once before and lost, never came back until now). When I play at a casino/betting site that I don't trust, I always take plenty of screenshots and video when I'm winning. I know what some bad PR can do to deter potential customers - it's the only thing you can really do to protect yourself when you're playing with BTC in the wild west.
I'm only here to help other people now by bringing some of the evidence out and shining a light on it. I will hold them accountable to what they owe me, or label them scammers and move on. If they attempt to discredit me or dispute anything in here, I have plenty more proof that hasn't been posted in the scam thread. Will keep you all posted if they ever pay.