Zi Yue's methods are indeed simple and crude...
Both Chen Qing and Shen Qi thought the same, it was almost obvious how it was done, and one could guess as much without much effort. The Thousand-Faced Fox couldn't bewitch the Emperor, but Transcendent Ali could alter other people's memories. As long as the Emperor could be persuaded, the rest would be much easier to resolve.
Although the Emperor was young, it would definitely be impossible to resolve by summoning and discussing with the ministers. If they were approached one by one, it would be the same as being controlled by Ali one by one. It must be said that Zi Yue was very good at using Ali's talent.