Looks like the casino has been robbed.
In such situations, I understand why casinos sometimes delay withdrawals and check exactly where the win came from.
I don't trust LTC Casinos claim at all. Story doesn't check out if you read what they actually said. None of the images are from LTC Casino. Why post from some unnamed casino when you have one of your own? And even if they were, the provider said they accept responsibility, so how are they out money.
Second of all, the only reason for LTC Casino slow paying OP was because they couldn't afford to pay him all at once. IT had nothing to do with security checks, and even if the claims of op being a scammer are true, that doesn't somehow make LTC Casino right just because he was wrong.