Why did Jiajing of Ming Dynasty let Yan Song write that Liu Biru lived in Zhihu Lake?

This is just commercial speculation's stunt. According to Mr. Deng Tuo's textual research on Liu Biju's old account book in the last century, Liu Biju was built in the Kangxi period of Qing Dynasty, originally named Sheng Yuan, and it was not renamed Liu Biju until the Qianlong period, which was hundreds of years later than itself, and Yan Song's inscription was even more nonsense. Therefore, consumers should keep their eyes open and not be deceived by specious lies of businesses. You can search for "Deng Tuo" specifically.