It is certain that he has been to China and settled in China (in the Yuan Dynasty at that time), but what he said about peanuts is definitely false, so that Europeans can visit China. In fact, China was still very good at that time.

Later, during the European Renaissance, the navigator Columbus just heard that there were peanuts in Asia and went there. Spain supports him. Although he didn't go to Asia, he discovered a new continent, which is quite worthy of the Spanish.

In a word, Kyle Poirot must have been to China, but his imagination is too rich to write that book.