Hui always amazes me with his 9900x payout hits. This was an ultimate one. To reach that hit he must have committed at least 1 bitcoin.
In fact he commited
way more than 1 BTC. He did a small, but nice profit.
In one of his posts on primedice chat he said that he doesn't do pre-roles, so therefore, it might be true that he had committed more than 1 btc to win that amount. It really needs patience.
before hit the 9900x payout he went -7 BTC , 1 btc wager for 9900x would be a very lucky hit