What are the unknown details in the movie detective chinatown?

In the story line of "Tang Tan 2", the murderer used China's five elements of Feng Shui to choose the target, which seemed professional and mysterious, but was finally exposed by the Tang people, saying that you didn't even put the incense burner right. When the murderer stiffly read the Tao Te Ching in English, the director literally translated it in English in that monologue and asked a foreigner to read the Tao Te Ching, but he didn't know it. It was used to echo the Tang people and point out that his incense burner was wrong. That is, you don't even know the culture you are pursuing, so you take it as the truth and kill people according to your own logic, but it becomes a joke in the eyes of those who know those cultures.