they probably need to transfer funds from the cold to the hot wallet
Yes, sure, but why they didn`t answer to email or here? 1 min to write something like: "Congrats. We need time. Pls wait 72 hour"
email them and ask them for a link to their cold and hot wallets and see if the total in them can cover your withdrawal
that wont be necesarry, either thecoins.net got no funds to pay out for what he had won or either that he conducted a fraud activity to win at the site, still no explanation from thecoins.net, So I will stick with option #2, since he had conducted fraud before at dicecoin.io