Any profession requires a certain skill and talent from a person. Firstly, this is important for quality work, and secondly, this can be impressive, which is what the chef in the video did.
He decided to show the guests a trick and did it with sparkle. Moreover, in the literal sense of the word. In cooking, this is called flambéing and is usually performed for show before serving the dish in front of the guest. However, everything is not so simple here. After all, for a high-quality “trick” you need to have special skills, skill and even dexterity.