Should the old man believe what he said about superior marriage, middle marriage, inferior marriage and taboo marriage? Any explanation?

The old man is a feudal superstition. Of course, he can't believe that first-class marriage and middle-class marriage are all fake. Everything depends on his own destiny, and he has mastered it. Others said that her marriage was good, and others said that she was unhappy when she got married, so he told a fortune. I might as well not believe it.