From Coco and chocolate by Arthur William Knapp what does the author mean in the sentence the name of the man who discovered the use of Coco must be written in some early chapter of history of a man, but is blurred and incredible

The person who first roasted Cocoa beans live so long ago, that the information is unknown
It is very important for historians to find out who thought of roasting, cocoa beans
Ancient cultures had no sense of history for their civilizations
All history books before 1500 are written in Uncle handwriting

The author means that the identity of the person who first discovered the use of Coco (presumably referring to the use of cocoa beans) must be mentioned in early chapters of the history of mankind. However, this information is unclear and hard to believe because it happened so long ago.