did some small test withdrawals and successfully withdrew $26k worth of shitcoins (eth, bch, ltc) but even 0.01btc was too much for the hot wallet right now and it went to pending manual.
You can't completely assume that the reason why your 0.01 btc withdrawal request went into pending manual is because their jot wallet is empty, it might just be the way the casino's withdrawal algorithm is programmed to operate or function.
Disregarding the fact that bitcoin has lost some value compared to the previous price before touching its previous all time today, 0.01 bitcoin is still worth a little above $600, not a very large amount, but still possible the casino might have some limit to an amount the withdrawal algorithm can process automatically, and anything above that, will require manual processing.
So, it's very possible that the above might be the situation and not that the casino's hot wallet is empty, except there is or was a way you can view the balances in the casino's hot wallet and know for sure when they are empty and when they are not, anything outside of this, then it's very possible what I first said might be the case.