What does he mean?

The occupation in a casino that deals with licensing and compensation.

Killing means getting back the chips lost by the guests, and losing means losing the lottery. In the United States, the word Zhuangjia generally refers to the staff of poker games, but there are exceptions. For example, the dealer of dice is also called the dealer. In Asia, the person in charge of game programs and chip processing at a gambling table is called Zhuanghe. The most common in casinos are lotus officials in purple uniforms, most of whom are female lotus officials.

Lotus official requirements:

Although he has no academic background, he must have no criminal record and have basic mental arithmetic and English communication skills. Because the odds are different every time you bet.

If you want to work out the winning or losing chips of the guests as quickly as possible, you can't make mistakes, and if you do it quickly, the guests will be angry and think that you are deliberately stalling.