Why did Lao Tzu write a comment joke about God replying to Tao Te Ching?

Although Laozi's Tao Te Ching is only five thousand words short, it has profound implications and can be called the first book of philosophy. For more than two thousand years, it has been painstakingly studied by scholars of past dynasties. However, until today, human beings have not been able to deeply explore and understand the profound meaning of Tao Te Ching and Lao Zi's Ming Xin in the universe, which is our great regret. Man's desire is infinite, and so is his potential. It is not impossible to make a thorough examination of Tao Te Ching. In view of this, we should study Tao Te Ching. In another sense, it is everyone's responsibility to inherit and carry forward our excellent cultural achievements. Gengxian