I'll refer you to the Bitcoin Wiki, specifically
Poon-Dryja payment channels. There's a distinction between a payment channel that is closed unilaterally versus a payment channel that is closed with both parties in agreement. If the Dice site have acknowledged your withdrawal (and it would be bad for any desire they might have for repeat-business if they didn't allow their customers to withdraw) you shouldn't face any issues. The on-chain timelock is to prevent cheating and for when there is a dispute.
In other words, without both parties agreeing your coins are still time locked and you have to wait.
The dice company is under no obligation to close their channel early and it is extra steps for them to do so for random users at random intervals, so much so , odds are they just ignore it and wait for the time lock to expire on their own.
Funny how onchain bitcoin relies on no one and LN relies on all parties involved to the point ,
they can allow time locks to hold your funds hostage on a whim.
Or, rather than trying in vain to make it sound worse than it really is, you could just concede and admit you might have actually learned something for once and that spreading FUD doesn't work.
If you had deposited funds on-chain to a dice site and your balance was in credit, they would have 100% control over those funds. If they don't want to acknowledge your withdrawal for the funds that are rightfully yours, you would get nothing, because there is nothing you can do to make them release the payment to you, other than perhaps involving law enforcement which probably wouldn't work anyway. You are wholly reliant on them being honest. The Bitcoin protocol is trustless, but any services you deposit funds to on-chain absolutely rely on a healthy (or possibly unhealthy) dose of trust on your part.
In a payment channel, powered by smart contracts, any funds left in your portion of the channel could be reclaimed even if the Dice site choose to be uncooperative or dishonest. Having to wait for a timelock is preferable to not getting your funds at all.
Next load of FUD for me to obliterate, plz?